A burrito costs $2 at Taco Hut. Let's use "b" to represent the cost of a burrito and "t" to represent the cost of a taco.
From the problem, we know that:
4b + 5t = 13 (for Clark)
5b + 3t = 13 (for Bruce)
We want to determine the cost of a burrito, so we can solve for "b" using the second equation:
[tex]5b + 3t = 13\\5b = 13 - 3\\b = (13 - 3t)/5[/tex]
Now we can substitute this expression for "b" into the first equation:
[tex]4b + 5t = 13\\4[(13 - 3t)/5] + 5t = 13\\52/5 - 12t/5 + 5t = 13\\52 - 12t + 25t = 65\\13t = 13\\t = 1[/tex]
So we know that a taco costs $1. Now we can substitute this value into either of the original equations to solve for "b":
[tex]5b + 3t = 13\\5b + 3(1) = 13\\5b = 10\\b = 2[/tex]
Therefore, a burrito costs $2 at Taco Hut.
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the ages of students at a university are normally distributed with a mean of 20. what percentage of the student body is at least 20 years old?
The percentage of the student body that is at least 20 years old is 50%.
The ages of students at a university are normally distributed with a mean of 20. To find the percentage of the student body that is at least 20 years old solution to the is as follows: As the Mean of ages of students at a university, μ = 20. Age is normally distributed so it will be divided into two groups Therefore, the mean age is equal to the median age. As the age is normally distributed, 50% of the population will have an age greater than or equal to 20 years old. Thus, the percentage of the student body that is at least 20 years old is 50%. Hence, the required percentage of the student body that is at least 20 years old is 50%.
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Dante collects baseball cards. He would like to keep the cards in an album. He has 10 cards for each of 24 teams. How many album pages will he need if each page can hold 8 cards? Show your work. Draw a picture if it helps.
Answer: 30 album pages
Step-by-step explanation:
cards = 10
teams = 24
total cards = 240
240 / 8 = 30
Using a graph estimate the solutions of the equation x^2 -2x+3=4
Answer: 23
Step-by-step explanation:
Data was collected on the amount of time that a random sample of 8 students spent studying for a test and the grades they earned on the test. A scatter plot and line of fit were created for the data.
scatter plot titled students' data, with points plotted at 1 comma 75, 2 comma 70, 2 comma 80, 2 comma 90, 3 comma 80, 3 comma 100, 4 comma 95, and 4 comma 100, and a line of fit drawn passing through the points 0 comma 60 and 2 comma 80
Find the y-intercept of the line of fit and explain its meaning in the context of the data.
5; for each additional hour a student studies, their grade is predicted to increase by 5% on the test
10; for each additional hour a student studies, their grade is predicted to increase by 10% on the test
60; a student who studies for 0 hours is predicted to earn 60% on the test
80; a student who studies for 0 hours is predicted to earn 80% on the test
The equatiοn οf the line οf best fit fοr this data-set is given as fοllοws:
y = 10x + 60.
Hοw tο οbtain the equatiοn fοr the line οf best fit?The slοpe-intercept definitiοn οf a linear functiοn is given as fοllοws:
y = mx + b.
In which the cοefficients are given as fοllοws:
m is the slοpe, representing the rate οf change οf the οutput οf the functiοn relative tο the input.
b is the y-intercept, representing the value assumed by the functiοn the input assumes a value οf zerο.
The functiοn gοes thrοugh pοint (0,60), hence the intercept b οf the line οf fit is given as fοllοws:
b = 60.
When x increases by 2, frοm 0 tο 2, y increases by 20, frοm 60 tο 80, hence the slοpe m is οbtained as fοllοws:
m = 20/2 = 10.
Hence the line οf fit is given as fοllοws:
y = 10x + 60.
Meaning that the third οptiοn is cοrrect.
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Complete question:
Data was cοllected οn the amοunt οf time that a randοm sample οf 8 students spent studying fοr a test and the grades they earned οn the test. A scatter plοt and line οf fit were created fοr the data.scatter plοt titled students' data, with pοints plοtted at 1 cοmma 75, 2 cοmma 70, 2 cοmma 80, 2 cοmma 90, 3 cοmma 80, 3 cοmma 100, 4 cοmma 95, and 4 cοmma 100, and a line οf fit drawn passing thrοugh the pοints 0 cοmma 60 and 2 cοmma 80
Determine the equatiοn οf the line οf fit.
y = 5x + 60
y = 5x + 80
y = 10x + 60
y = 10x + 80
Answer:
The equatiοn οf the line οf best fit fοr this data-set is given as fοllοws:
y = 10x + 60.
Step-by-step explanation:
If the area of a bookshelf is 216 in.² if the length of the bookshelf is 36 inches what is the width of the bookshelf
The width of the bookshelf will be 6 inches when the area and length are 216 in and 36 inches.
What is the width?
Width is a dimension of a geometrical figure that tells about the structure of the figure. In general, width is used to measure the object.
What is formulae of width?
Width is obtained by dividing area and length.
W=A/L
substitute values, 216/36= 6inches.
The width is gonna be 6 because all you have to do is divide 216 and 36
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It takes jerry 3 hours to clean all the tank in his section. It take hart x hours to clean all the tanks in his section. If they work together they can clean the tanks in 1 hour. What fraction does Jerry get done in 1 hour
The amount or fraction of work Jerry gets done in 1 hour is 1/3 when it takes him 3 hours to clean all the tank in his section and it take Hart x hours to clean all the tanks in his section.
We know that it takes jerry 3 hours to clean all the tank in his section and it take Hart x hours to clean all the tanks in his section,
when they work together, they can clean the tanks in 1 hour.
now let work be - 1
therefore,
work x Jerry = work x Hart
1×3 = 1×x
3 = 1x
3 = x
therefore in 1 hour work done by Jerry will be 1/3.
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The baker receives an order of 80 chocolate pies for a community festival. The baker needs 3 cups of milk to make each pie. How much milk, in gallons, is needed to make the 80 pies for the festival?
the baker needs 15 gallons of milk to make 80 chocolate pies for the community festival. To find out how much milk is needed to make 80 chocolate pies, we need to first determine the total amount of milk required for one chocolate pie. We know that the baker needs 3 cups of milk to make one chocolate pie.
To convert cups to gallons, we need to divide by 16 since there are 16 cups in a gallon. So, one chocolate pie requires 3/16 gallons of milk.
To find out how much milk is needed to make 80 chocolate pies, we can multiply the amount of milk required for one pie by the number of pies. This gives us:
(3/16) gallons of milk per pie x 80 pies = 15 gallons of milk
Therefore, the baker needs 15 gallons of milk to make 80 chocolate pies for the community festival.
It's important to make sure we convert units correctly when solving these types of problems. In this case, we had to convert cups to gallons to make sure we were using the same unit of measurement for both the amount of milk needed for one pie and the total amount needed for 80 pies. By following these steps, we can accurately determine the amount of ingredients needed to fulfill an order, which is important for bakers and other food service professionals.
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there are 15 equations and 15 unknowns. what are those 15 equations and 15 unknowns. list them all. explain the purpose of each set of equations. explain how they are derived. g
The 15 equations and 15 unknowns are part of a system of linear equations. These equations can be used to find the values of the 15 unknowns. The purpose of each set of equations is to determine the unknowns in the system. The equations are derived using algebraic methods such as substitution, elimination, and graphing.
The 15 equations are:
1. x + y = 15
2. x - y = 5
3. 2x + 4y = 60
4. x + 2y = 30
5. 3x + y = 45
6. 3x - y = 35
7. x + 4y = 40
8. 4x + y = 55
9. x - 4y = 5
10. 2x - y = 15
11. 3x - 2y = 20
12. 5x + y = 55
13. x - 5y = -5
14. 2x + 5y = 55
15. 4x - 3y = 25
The 15 unknowns are:
1. x
2. y
3. x + y
4. x - y
5. 2x + 4y
6. x + 2y
7. 3x + y
8. 3x - y
9. x + 4y
10. 4x + y
11. x - 4y
12. 2x - y
13. 3x - 2y
14. 5x + y
15. x - 5y
Each equation is derived using algebraic methods such as substitution, elimination, and graphing. By substituting the known values into the equations, the unknowns can be determined. Elimination is used to get rid of terms from the equations, making it easier to solve for the unknowns. Graphing is used to plot out the equations and to help visualize the relationships between the unknowns and the equations.
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is the given value a solution of the inequality t-7<10, t = 28
Answer:
28 is NOT a given solution to the equality
Step-by-step explanation:
For this inequality, we substitute 28 for t and see if the left side is less than the right side.
[tex]t - 7 < 10, t = 28\\(28) - 7 < 10\\21 < 10 \\False[/tex]
The statement is false, therefore the number provided is not a solution
write a linear equation with a slope of -7
Beginning the e-commerce development process with a mobile presence rather than a desktop website is referred to as which of the following?
1. A) RWD 2. B) AWD 3. C) mobile rst design 4. D) RESS
Beginning the e-commerce development process with a mobile presence rather than a desktop website is referred to as Mobile First Design.Mobile First Design is a strategy for designing responsive websites that prioritize mobile devices over desktop computers. This means that when designing a site, the mobile experience comes first, followed by the tablet and desktop experiences.
Mobile First Design has become a popular design strategy due to the increasing use of mobile devices to access the internet. It acknowledges the fact that mobile devices have smaller screens, slower internet connections, and limited processing power, which means that websites must be designed to work well on these devices
Mobile First Design includes a variety of design strategies to optimize sites for mobile devices, including responsive design, adaptive design, and progressive enhancement. Responsive design involves using flexible grids, images, and media queries to create a website that responds to the screen size of the device it's viewed on.Adaptive design uses a combination of flexible and fixed elements to create a website that adapts to different screen sizes.
Progressive enhancement involves designing a website with basic functionality that works well on any device, and then adding additional features for more capable devices as they become available.
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An international food festival charges for admission and for each sample of food. Admission and 4 samples cost $8. 75. Admission and 8 samples cost $12. 75. Write a linear function rule to model the cost y for any number of samples x
The linear function rule to model the cost y for any number of samples x is (y = x + 2.25) and this can be determined by forming the linear equation.
An international food festival charges for admission and for each sample of food.
Admission and 6 samples cost $8.25.
Admission and 8 samples cost $10.25.
The following steps can be used in order to determine the linear function rule to model the cost y for any number of samples x:
Step 1 - The linear equation is formed in order to determine the linear function.
Step 2 - The linear equation that represents the situation "admission and 6 samples cost $8.25" is:
8.25 - 6c = d --- (1)
Step 3 - The linear equation that represents the situation "admission and 8 samples cost $10.25" is:
10.25 = 8c + d --- (2)
Step 4 - Substitute the value of 'd' in equation (2).
10.25 = 8c + 8.25 - 6c
2 = 2c
c = 1
Step 5 - Substitute the value of 'c' in the equation (1).
d = 8.25 - 6
d = 2.25
Step 6 - So, the linear function rule to model the cost y for any number of samples x is:
y = x + 2.25.
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WILL GIVE BRAINLIST AND EXTRA POINTS TO BEST ASNWER HELP!!
The graph of an exponential of the form y = ab contains the points (2, 60) and (4, 960). What are the values of a and b
lets use the two given points to form a system of equations and solve for the values of a and b.
Starting with the given equation:
y = ab
At point (2, 60):
60 = ab^(2)
At point (4, 960):
960 = ab^(4)
Now we can solve for a and b using algebraic manipulation.
First, we can divide the second equation by the first equation:
960/60 = (ab^(4))/(ab^(2))
16 = b^(2)
Taking the square root of both sides, we get:
b = 4
Substituting b = 4 into either of the two equations, we can solve for a:
60 = a(4^(2))
60 = 16a
a = 60/16
a = 15/4
Therefore, the values of a and b are:
a = 15/4
b = 4
So the exponential function is:
y = (15/4) * 4^x
"another way, same answer "
PLEASE HELP
find the equation of the line
using exact numbers
Answer: y = -3x + 7
Step-by-step explanation:
slope = -3
y intercept = 7
SHOW YOUR WORK BELOW! PLEASE SOMEONE
80 POINTS
The equation to the given graph is y= (1/2) * 2ˣ. So correct option is B.
Describe Parabola?A parabola is a type of curve that results from the intersection of a cone with a plane that is parallel to one of its sides. It is a conic section, which means it is a geometric shape that can be formed by cutting a cone with a plane.
The shape of a parabola is similar to that of a U-shaped curve, but it is symmetric around a vertical line called the axis of symmetry. The point where the axis of symmetry intersects the parabola is called the vertex.
The equation of a parabola can be written in different forms, but the most common form is:
y = ax^2 + bx + c
where "a", "b", and "c" are constants that determine the shape, position, and orientation of the parabola. If "a" is positive, the parabola opens upward, and if "a" is negative, it opens downward.
We can observe that the given graph passes through the points (-1,1), (0,2), (1,4), (2,8). This suggests that the graph is a parabola that opens upwards.
We can use the general form of a quadratic equation to write the equation of the parabola in the form y = ax² + bx + c, where a, b, and c are constants. Since the parabola opens upwards, we know that the coefficient of the x² term is positive.
To find the values of a, b, and c, we can substitute the coordinates of the given points into the equation and solve the resulting system of equations.
Using the point (-1,1), we get:
1 = a(-1)² + b(-1) + c
1 = a - b + c
Using the point (0,2), we get:
2 = a(0)² + b(0) + c
2 = c
Using the point (1,4), we get:
4 = a(1)² + b(1) + c
4 = a + b + c
Using the point (2,8), we get:
8 = a(2)² + b(2) + c
8 = 4a + 2b + c
Substituting c = 2 from the second equation into the third and fourth equations, we get:
4 = a + b + 2
8 = 4a + 2b + 2
Simplifying these equations, we get:
a + b = 2
2a + b = 3
Solving for a and b, we get:
a = 1
b = 1
Therefore, the equation of the parabola is y = x² + x + 2.
To check which of the given options matches this equation, we can simplify the equation:
y = x² + x + 2
y = (x + 1/2)² + 7/4
This shows that the given parabola is a vertical shift of the standard parabola y = x² by 7/4 units upward.
Out of the given options, the only equation that matches this form is option B, y = (1/2) * 2ˣ. Therefore, the answer is B) y= (1/2) * 2ˣ.
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What is the slope of the line through (–2,3) and (1,–3) in the standard (x,y) coordinate plane
The slope of the line through (-2,3) and (1,-3) is -2.
What is slope-intercept form?Y = mx + b, where m is the line's slope and b is the y-intercept, is the slope-intercept form of a linear equation (the point where the line intersects the y-axis). This form is helpful because, given a line's equation, it enables us to quickly determine the slope and y-intercept. By charting the y-intercept and utilising the slope to identify additional points on the line, we can also use this technique to graph a line. We can also create an equation for a line given its slope and y-intercept using this approach.
The slope of the line is given as:
slope = (y2 - y1) / (x2 - x1)
Substituting the value of the given coordinates we have:
slope = (-3 - 3) / (1 - (-2))
slope = -6 / 3
slope = -2
Hence, the slope of the line through (-2,3) and (1,-3) is -2.
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Jackson is making lemonade for a class party. He uses 3 tablespoons (tbsp. ) of lemonade mix for each 6 ounces of water. He wants to make 4 quarts of lemonade. How much lemonade mix does Jackson need?
A
2 tbsp. B
16 tbsp. C
32 tbsp. D
64 tbsp
As per the unitary method, Jackson needs 64 tablespoons of lemonade mix to make 4 quarts of lemonade. (option D).
First, we need to convert the 4 quarts of lemonade into ounces since we know the ratio in terms of ounces. One quart is equal to 32 ounces (8 oz per cup and 4 cups per quart). So, 4 quarts would be equal to 128 ounces (32 oz x 4).
Next, we need to determine how much lemonade mix is needed for every 6 ounces of water.
Therefore, the ratio of lemonade mix to water is 3 tablespoons/6 ounces.
Now that we have the ratio, we can use it to find out how much lemonade mix is needed for 128 ounces of water (4 quarts). We can set up a proportion using the ratio we just found:
3 tbsp / 6 oz = x tbsp / 128 oz
We want to solve for x, which represents the amount of lemonade mix needed for 128 ounces of water. To solve for x, we can cross-multiply and simplify:
3 tbsp x 128 oz = 6 oz x
384 tbsp oz = 6x
x = 64 tbsp
So the answer is D) 64 tbsp.
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is the number of linearly independent columns in a matrix a equal to the number of linearly independent rows in a? why?
Yes, the number of linearly independent columns in a matrix A is equal to the number of linearly independent rows in A.
This is because the definition of linear independence states that no linear combination of a set of vectors can equal the zero vector, so if one set of vectors is linearly independent, the other set of vectors must also be linearly independent.
To explain further, the number of linearly independent vectors in a matrix A is determined by the rank of the matrix. The rank of a matrix is the number of linearly independent rows and columns in the matrix.
So if the rank of A is n, then the number of linearly independent columns and rows of A must be n. This is because if there are n linearly independent columns in the matrix, the number of linearly independent rows must also be n.
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what is the missing fraction in __ - 3/4 = 2/3?
Answer:
Step-by-step explanation:
[tex]\frac{2}{3}[/tex] +[tex]\frac{3}{4}[/tex]
=[tex]\frac{17}{12}[/tex]
a drug for the relief of asthma can be purchased from 10 different manufacturers in liquid, tablet, or capsule form, all of which come in regular and extra strength. how many different ways can a doctor prescribe the drug for a patient suffering from asthma?
So there are 200 different ways a doctor can prescribe the asthma drug to a patient, taking into account the various options for form, manufacturer, and strength.
This illustrates the importance of carefully considering all the available options and selecting the most appropriate prescription for each patient's unique needs.The number of different ways a doctor can prescribe the asthma drug to a patient depends on the number of options available for each of the three factors: form, manufacturer, and strength.
For each of the three factors, there are 10 different options. Therefore, the total number of different ways the doctor can prescribe the drug is the product of the number of options for each factor:
10 options for form x 10 options for manufacturer x 2 options for strength (regular or extra) = 200 total options.
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A rock dropped from a bridge 320 feet above a river. The pathway that the rock takes can me molded by the equation h=-16t^2+320. How long will it take the rock to reach the river?
With given quadratic equation for time, it will take the rock approximately 4.47 seconds to reach the river.
What exactly are quadratic equations?
Quadratic equations are equations of the second degree, meaning they involve terms raised to the power of two. These equations are written in the form of ax² + bx + c = 0, where x is the unknown variable, and a, b, and c are constants (numbers).
The graph of a quadratic equation is a curve called a parabola, which can be either upwards or downwards depending on the sign of the coefficient a. Quadratic equations can have one, two, or zero real solutions, depending on the discriminant b² - 4ac.
Now,
In this equation, h represents the height of the rock above the river at time t in seconds. When the rock hits the river, its height h will be zero. So we can set h to zero and solve for t:
h = -16t² + 320
0 = -16t² + 320 (substituting h = 0)
16t² = 320
t² = 20
t = ±√20
Since time cannot be negative, we take the positive square root:
t = √20 ≈ 4.47 seconds
Therefore, it will take the rock approximately 4.47 seconds to reach the river.
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Rewrite r=1.5 sin theta in rectangular form
The polar curve r = 1.5sinθ in rectangular form is x² + y² - 1.5y = 0
How to write the polar curve in rectangular form?Since we have the polar curve r = 1.5sinθ and we want to convert it to rectangular form, we proceed as follows
We know that in rectangular form the polar curve is
x = rcosθ (1) and y = rsinθ (2)x² + y² = r² (3)So, multiplying r = 1.5sinθ by r, have that
r = 1.5sinθ
r × r = r × 1.5sinθ
r² = 1.5rsinθ
Substituting this into equation (3), we have that
x² + y² = r² (3)
x² + y² = 1.5rsinθ (4)
From equation (2), y = rsinθ
So, substituting this into equation (4), we have that
x² + y² = 1.5rsinθ
x² + y² = 1.5y
x² + y² - 1.5y = 0
So, the rectangular form is x² + y² - 1.5y = 0
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Consider the equation − 2(x + 2) = x − 3(x + 1) − 1. Is it always true, sometimes true, or never true?
Answer: Always true.
Step-by-step explanation: Use algebra. They end up being the same statements, which means x could be whatever and the equation would still be true.
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What is the value of θ for the acute angle in a right triangle?
sin(θ)=cos(44°)
Therefore, the value of θ for the acute angle in a right triangle is 46°.We can use the fact that the sine and cosine of complementary angles are equal to find θ.
To find the value of θ for the acute angle in a right triangle, we need to use one of the trigonometric ratios. In this case, we are given the sine of θ and the cosine of 44°. Recall that the sine of an angle θ is defined as the ratio of the opposite side to the hypotenuse in a right triangle:
sin(θ) = opposite / hypotenuse
And the cosine of an angle φ is defined as the ratio of the adjacent side to the hypotenuse:
cos(φ) = adjacent / hypotenuse
In a right triangle, the two acute angles are complementary, which means that their sum is 90°. That is,θ + 90° = 90°
θ = 90° - 44°.Now we can use the given equation sin(θ) = cos(44°) and substitute θ: sin(90° - 44°) = cos(44°) => sin(46°) = cos(44°)
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Find sin X pleaseeee
Answer:
sin(x) = 9/41
Step-by-step explanation:
Find the terms through degree 4 of the Maclaurin series of .
Use multiplication and substitution as necessary.
f(x)=(1+x)^−7/3
Therefore , the solution of the given problem of function comes out to be 1, -7/3x, 35/27x², -455/162x³, 4368/6561x⁴.
What does the term function actually mean?The midterm exam will include questions on design, geometry, numbers, each division, as well as actual and hypothetical geographic places. A piece of work describes the connections between variable elements that cooperate to produce the same outcome. A utility is a structure made up of numerous unique parts that work together to create unique outcomes for each input.
Here,
This is how the Maclaurin sequence is given:
=> F(x) = [tex]f(0) + f'(0)x + f''(0)x^2/2! + f'''(0)x^3/3! + f''''(0)x^4/4![/tex]+ ...
where the values of the function and its derivatives at the value of x are f(0), f'(0), f''(0), f'''(0), and f''''(0).
Let's determine f(x)'s first four derivatives:
=> f'(x) = (-7/3)(1+x) where f(x) = [tex](1+x)(-7/3)^(-10/3)[/tex]
=> f''(x) = [tex](70/9)(1+x)^(-13/3)[/tex]
=> f'''(x) = [tex](-910/27)(1+x)^(-16/3)[/tex]
=> f''''(x) = [tex](21840/81)(1+x)^(-19/3)[/tex]
Now, we can add these to the formula for the Maclaurin series:
=> f(x) = [tex]f(0) + f'(0)x + f''(0)x^2/2! + f'''(0)x^3/3! + f''''(0)x^4/4![/tex]+ ...
=> f(x) = [tex]f(0) + (-7/3)*f(0)*x + (70/9)*f(0)x^2/2! + (-910/27)f(0)x^3/3! + (21840/81)f(0)x^4/4![/tex] + ...
=> f(x) = f(0)[tex](1 - 7/3x + 35/27x^2 - 455/162x^3 + 4368/6561x^4 + ...)[/tex]
=> f(x) = [tex]f(0)(1 - 7/3x + 35/27x^2 - 455/162x^3 + 4368/6561*x^4)[/tex]
=> f(0) = [tex](1+0)^(-7/3) = 1[/tex]
Replacing the incomplete episodes with:
=> f(x) = 1 – 7 – 3 – 35 – 27 – 455 – 162 – 4368 – 6561 x
The elements of the Maclaurin series of (1+x)(-7/3) up to degree 4 are as follows:
=> 1, -7/3x, 35/27x², -455/162x³, 4368/6561x⁴
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A rectangular photograph is 8 inches by 10 inches. It will be put into a rectangular frame that is 2 inches wide on all sides. What is the area of the photograph when it is put into the
frame?
Answer:
the area of the photograph when it is put into the frame is 80 square inches, and the area of the frame is 88 square inches.
Step-by-step explanation:
Answer: 36 inches(2)
Step-by-step explanation:
Oliver ask 20 children's how they travel to school you are other reasonOliver ask 20 children's how they travel to school here are the reason walkOliver ask 20 children's how they travel to school here are the reason what three bicycle 2 calculate the percentage of the children who travel to school by bicycle
From the given information provided, the percentage of children who travel by bicycle is 15%.
According to the given information, out of 20 children, 3 of them travel to school by bicycle. To calculate the percentage of children who travel to school by bicycle, we need to divide the number of children who travel by bicycle by the total number of children and multiply by 100.
Percentage of children who travel to school by bicycle = (Number of children who travel by bicycle / Total number of children) x 100%
= (3/20) x 100%
= 15%
Therefore, the percentage of children who travel to school by bicycle is 15%.
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using traditional methods, it takes 101 101 hours to receive a basic flying license. a new license training method using computer aided instruction (cai) has been proposed. a researcher used the technique with 140 140 students and observed that they had a mean of 100 100 hours. assume the standard deviation is known to be 6 6 . a level of significance of 0.01 0.01 will be used to determine if the technique performs differently than the traditional method. is there sufficient evidence to support the claim that the technique performs differently than the traditional method? what is the conclusion?
In the following question, Yes, there is sufficient evidence to support the claim that the computer-aided instruction (CAI) technique performs differently than the traditional method.
To determine this, a two-tailed hypothesis test can be performed using the sample data given. The null hypothesis is that the computer-aided instruction technique has the same mean as the traditional method (101 hours). The alternative hypothesis is that the computer-aided instruction technique has a different mean than the traditional method (101 hours). With a sample mean of 100 hours, a sample size of 140 students, a known population standard deviation of 6 hours, and a level of significance of 0.01, the hypothesis test is conducted and results in a p-value of less than 0.01. This suggests that there is sufficient evidence to reject the null hypothesis and support the alternative hypothesis, that the computer-aided instruction technique performs differently than the traditional method. The conclusion is that the computer-aided instruction technique has a different mean than the traditional method.
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There is sufficient evidence to support the claim that the new license training method using computer-aided instruction performs differently than the traditional method. Therefore, the researcher can proceed with the new method.
Hypothesis testing is a technique used to make inferences about the population based on the sample data. It is divided into two types, one-tailed and two-tailed. A two-tailed test involves testing for the difference between the two population means, while a one-tailed test involves testing for a higher or lower population mean. A level of significance is predetermined to accept or reject the null hypothesis.
Given, using traditional methods, it takes 101 hours to receive a basic flying license. A new license training method using computer-aided instruction (CAI) has been proposed. A researcher used the technique with 140 students and observed that they had a mean of 100 hours. Assume the standard deviation is known to be 6.
We have to determine if there is sufficient evidence to support the claim that the technique performs differently than the traditional method at a level of significance of 0.01.
Null Hypothesis H₀: μ₁ = μ₂ (The new technique and traditional method do not perform differently.)
Alternate Hypothesis H₁: μ₁ ≠ μ₂ (The new technique and traditional method perform differently.)
The test statistic for testing the difference in two population means with known standard deviation is given by:
z = (x₁ - x₂) / (σ/√n)
Where,
x₁ = sample mean of the new technique
x₂ = sample mean of the traditional method
σ = known standard deviation
n = sample size
z = test statistic
z = (100 - 101) / (6 / √140)
z = -2.624
The corresponding p-value can be obtained from the Z-table.
p-value = P(z < -2.624) + P(z > 2.624)
p-value = 0.0088 + 0.0088
p-value = 0.0176
The level of significance α = 0.01
Since p-value < α, we can reject the null hypothesis.
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Ian went to dinner last night and remembers leaving a 6.50 tip. The tip was 20% of the cost of dinner. What was the cost of dinner before tip?
Answer:
$32.50
Step-by-step explanation:
20% * y = 6.5 =>
y =6.5 ÷ 20% =
6.5 ÷ (20 ÷ 100) =
(100 × 6.5) ÷ 20 =
650 ÷ 20 =
32.5
Percentage of 20% of what number = 6.5?
20% × ? = 6.5
20% of 32.5 = 6.5