The cold water tap can fill a container two hours faster than the hot water tap. The two taps together can fill a container in 80 minutes. How long does it take each tap to fill the container on its own?

Answers

Answer 1

Answer:

4 hours and 2 hours

Step-by-step explanation:

Let the time for cold tap be c and hot tap be h.

Convert2hrs = 120 min

Set equations

The cold water tap can fill a container two hours faster than the hot water tap:

c - h = 120

The two taps together can fill a container in 80 minutes:

1/c + 1/h = 1/80

Solve the system by substitution

c = h + 1201/c + 1/h = 1/801/(h + 120) + 1/h = 1/80(h + h + 120)/(h(h+120)) = 1/8080(2h + 120) = h(h + 120)160h + 9600 = h² + 120hh² - 40h - 9600 = 0h² - 40h + 400 = 10000(h - 20)² = 100²h - 20 = 100 (taking positive root only, since time is positive value) h = 120 min = 2 hrs

Find c

c = 120 + 120 = 240 min = 4 hrs


Related Questions

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. Only 1 try remaining for this problem or else I get a zero. Please help if you know the answer or how to solve.

Answers

Using the shell method, the volume is

[tex]\displaystyle 2\pi \int_0^1 (2-x) \cdot 8x^3 \, dx = 16\pi \int_0^1 (2x^3 - x^4) \, dx[/tex]

Each cylindrical shell has radius [tex]2-x[/tex] (the horizontal distance from the axis of revolution to the curve [tex]y=8x^3[/tex]); has height [tex]8x^3[/tex] (the vertical distance between a point on the [tex]x[/tex]-axis in [tex]0\le x\le1[/tex] and the curve [tex]y=8x^3[/tex]).

Compute the integral.

[tex]\displaystyle 16 \pi \int_0^1 (2x^3 - x^4) \, dx = 16\pi \left(\frac{x^4}2 - \frac{x^5}5\right) \bigg|_{x=0}^{x=1} \\\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ = 16\pi \left(\frac12 - \frac15\right) \\\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ = \frac{24}5\pi = \boxed{4.8\pi}[/tex]

A musician kept track of the concert arenas on this year's tour and found that 60% of the arenas were sold out. Of those that were not sold out, 25% had been on the previous tour schedule from last year, while 90% of those that were sold out were on the previous tour schedule. Which of the following represents the joint relative frequency of arenas that were sold out and not on the previous tour schedule?

75%
54%
30%
6%

Answers

Answer:

6%

Step-by-step explanation:

First, let's break this down:

60% of arenas sold out

90% had been on previous tour

Out of those arenas that did NOT sell out

25% had been on previous tour

We want to know the joint relative frequency of area that were sold out AND NOT on the previous tour schedule, therefore all the information about areas that did NOT sell out is irrelevant.

Because 90% of the areas that were sold out had been on the previous tour, 10% had NOT been on the previous tour.

Therefore, considering all the arenas, 10% of 60% of the arenas were sold out and not on the previous tour.

Let x equal the total number of arenas:

[tex](.10)(.60)x=0.06x[/tex]

Convert to percent

6%

Therefore, the joint relative frequency of sold out arenas that were not on the previous tour is 6%.

A car uses 3.75 gallons of gas to travel 100.5 miles. How much gas will they use after 20 miles?

Answers

3.75/100.5 = 0.03731343 gallons per mile

0.03731343 x 20 = 0.74626866 = 0.75 gallons after 20 miles.

How to solve the equation

Answers

Answer:

x = -26

Step-by-step explanation:

[tex](f-g)(x)=\frac{4}{x-3}-\frac{3}{x+5}=\frac{3}{x^2 +2x-15} \\ \\ \frac{4(x+5)-3(x-3)}{x^2 +2x-15} \\ \\ =\frac{4x+20-3x+9}{x^2 +2x-15}=\frac{3}{x^2 +2x-15} \\ \\ \frac{x+29}{x^2 +2x-15}=\frac{3}{x^2+2x-15} \\ \\ x+29=3 \\ \\ x=-26[/tex]

This is in the domain of the equation, and is thus a solution.

an angle measures 85.2 less than the measure of its supplementary angle. what is the measure of each angle? it should be 2 angles or answers. please answer quick. i will mark brainliest. thank you

Answers

The two angles are in the box
check the image below for working

Answer:

  47.4°, 132.6°

Step-by-step explanation:

Given the difference of two angles is 85.2° and their sum is 180°, you want to find their measures.

Setup

Let the smaller angle be represented by x. Then the larger angle is (x +85.2). Their sum is ...

  x +(x +85.2) = 180

Solution

Simplifying the equation, we get ...

  2x +85.2 = 180

  2x = 94.8 . . . . . . . . subtract 82.5

  x = 47.4 . . . . . . . divide by 2

  x +85.2 = 132.6

The two angles are 47.4° and 132.6°.

7th grade question

easy question

Answers

I think C is the answer
The answer is B because think about it, 24:2 right? Divide that by 2 : 24/2= 12 and 2/2= 1 soooo 12:1

C
Using a Number Line to Add Fractions
Slide the green dot from 0 to plot the number at the correct
location.
Plot
-3.5 -3 -2.5 -2 -1.5 -1 -0.5 0
0.5 1
Use the number line to find
O
19
4
O
19
8
O-2
21
¹()+(-3¹)
8
21
8

Answers

Answer:

c

Step-by-step explanation:

C

Using a Number Line to Add Fractions

Slide the green dot from 0 to plot the number at the correct

location.

Plot

-3.5 -3 -2.5 -2 -1.5 -1 -0.5 0

0.5 1

Use the number line to find

O

19

4

O

19

8

O-2

21

¹()+(-3¹)

8

21

8

Salaries for teachers in a particular elementary school district are normally distributed
with a mean of $44,000 and a standard deviation of $6,500.

Answers

Thus standard daviation is x~N(4400,6500)

Let X denote the salaries for all the teachers in a particular alimentary school.

As per the generation X is commonly distinguished with a mean of u=44,000

standard daviation of €=$6500

The answer is x~N(44000,6500)

Since the 10 teachers are survived randomly from the district

The site of n=10

Variable€x present salary of all 10 teachers in a particular alimentary sel.

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Find the perimeter and area of a rectangle with side length of 12 cm and width of 6 cm.

Answers

Area would be 72 since 12 times 6
perimeter would be 30 when you add all sides together

Nathan earns $78.75 for working 5 hours. Calculate the unit rate. How much money does he earn in 1 hour?​

Answers

Answer: $15.75

Step-by-step explanation:

$78.75/5 hr=$15.75/hr

Answer:

He earns $15.75 an hour

Step-by-step explanation:

You have to divide $78.75 by 5 to get the unit rate(earnings for 1 hour).

Please helpppp!!! I suck at simplifying

Answers

Answer:2³ * 2⁷ = 2³⁺⁷ = 2¹⁰

c 2^10 should be correct

Please solve the Quadratic Equation

2z^2 +13z +15 = 0


Please show steps for Brainliest!

Answers

Here you go
Check the image below for working
z has two answers -3/2 and -5

5. Daunte's favorite video game store is running a clearance sale. Every week until
everything is sold, the store's owner is going to reduce the price of the remaining
merchandise by 25%. Duante figures that he should wait 4 weeks to go to the
store because then the merchandise will be 100% off! Construct a mathematical
argument involving an exponential function to explain whether Daunte is correct
or incorrect.

Answers

Daunte is incorrect. After 4 weeks, the price would be 68.5 percent off.

Is Daunte correct?

An exponential function is a mathematical function that has the form : f(x) = a^x

Where:

a = constant x = variable

An exponential function indicates that the quantity is either increasing at a faster rate or reducing at a faster rate. This is true because an exponential increase or decrease is faster than a linear increase or decrease. In a linear increase or decrease, the function is either increasing or decreasing at a constant value.

The price of the video games would reduce by 25% of the previous weeks' price. Thus, the function that would represent this is an exponential function.

The form of the exponential equation would be:

Price after 4 weeks = Initial price x (1 - percentage decrease)^number of years

Let's assume that the initial price is 100

100 x (1 - 0.25)^4

100 x (0.75)^4 = 31.64

The total percentage decrease in the price of the good: (current price initial price) - 1

(31.64 / 100) - 1 = 0.684 = 68.4%

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PLS HELP!!!
Solve.
2x-y+2z=-6
-3y+z=-2
2x-3z+4

Answers

The solution to the system of equations is x = -8/7, y = 4/7 and z = -2/7

How to solve the system of equations?

The system of equations is given as

2x - y + 2z = -6

-3y + z = -2

2x - 3z = -4

Subtract 2x - 3z = -4 from 2x - y + 2z = -6

This is represented as

(2x - y + 2z = -6) - (2x - 3z = -4)

This gives

- y + 5z = -2

Multiply - y + 5z = -2 by 3

-3y + 15z = -6

Subtract -3y + 15z = -6 from -3y + z = -2

This is represented as

(-3y + z = -2) - (-3y + 15z = -6)

This gives

-14z = 4

Divide by -14

z = -2/7

Substitute z = -2/7 in - y + 5z = -2

- y - 5 * 2/7 = -2

This gives

- y - 10/7 = -2

Rewrite as:

y = 2 - 10/7

Evaluate

y = 4/7

Substitute z = -2/7 in 2x - 3z = -4

2x - 3 * 4/7 = -4

This gives

2x - 12/7 = -4

So, we have:

2x = 12/7 - 4

Evaluate

2x = -16/7

Divide by 2

x = -8/7

Hence, the solution to the system of equations is x = -8/7, y = 4/7 and z = -2/7

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=
How many gallons of a 50% antifreeze solution must be mixed with 70 gallons of Strength
25% antifreeze to get a mixture that is 40% antifreeze? Use the six-step method.

Answers

The number of gallons that must be needed to antifreeze 50% solution is 105.

Given that 50% antifreeze solution must be mixed with 70 gallons of Strength 25% antifreeze to get a mixture that is 40% antifreeze.

The six-step method involves a few steps that need to perform. These are defining the problem, determining the root cause, finding the alternative solution to solve the problem, selecting the solution, implementing the solution, and finally evaluating the outcome.

Let's consider x be the number of gallons of a 50% antifreeze solution.

As we know we need to make an antifreeze solution by adding the given quantities.

Hence,

x×50%+70×25%=40%×(x+70)

x×0.5+70×0.25=0.4×(x+70)

Now, we will multiply the numbers, we get

0.5x+17.5=0.4(x+70)

Now, we will multiply both sides by 10, we get

0.5x×10+17.5×10=0.4(x+70)×10

5x+175=4(x+70)

5x+175=4x+280

Further, we will subtract 175 from both sides, we get

5x+175-175=4x+280-175

5x=4x+105

Furthermore we will subtract 4x from both sides, we get

5x-4x=4x+105-4x

x=105

Hence, 105 gallons of 50% antifreeze solution must be needed.

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Help !!! Evaluate -3 5
-7 7

Answers

The bases(7) are same so add the exponents -3+5
-7^2
=-49
The right option is C
hope this helped :)

Select all names that apply

Answers

Answer:

  A  irrational

  B  real

Step-by-step explanation:

Given the value π/7, you want to classify it as whole, integer, real, and/or irrational.

Number classification

Any number that does not have an imaginary part is a real number. Real numbers include integers, whole numbers, and natural numbers, none of which have any fractional part.

Any ratio of integers (with a non-zero denominator) is a rational number. All other real numbers are irrational numbers. Pi (π) is an irrational number.

When rational numbers are written as decimal numbers, their fractional part will either terminate or repeat. When the fractional part of a decimal number does not terminate or repeat, but continues indefinitely, the number is irrational.

Pi/7

As we said, pi is an irrational number. Multiplying it by a rational number (1/7) does not change its classification.

  π/7 is irrational and real

A truck costing $56,000 has accumulated depreciation of $50,000. The truck is sold for $8,500. What is the journal entry for this transaction?

Answers

14500 !!!!!!!!!!!!!!!!!

Answer: debit Cash for​ $8,500, debit Accumulated Depreciation− Truck for​ $50,000, credit Truck for​ $56,000, and credit Gain on Disposal for​ $2,500.

An image of a book shown on a website is 1.5 inches wide and 3 inches tall on a computer monitor. The actual book is 10.5 inches wide.

Answers

The book in real life is 7 times larger than the one on the website. When you divide 10.5/1.5 you get 7. So multiplying 3 by 7 will get you 21.

Therefore, the real book is 21 inches tall

Find each of the following sums by first deciding if the answer is positive or negative and then using subtraction to help find the final answer (a) -237+359 (b) 87+-163 (c)-35.7+22.9 (d)8.79+6.41

Answers

Given the given task content, the answer to the sums are:

The answer is positiveThe answer is negativeThe answer is negativeThe answer is positive

Subtraction of numbers

The subtraction of numbers is difference between two or more numbers

(a) -237 + 359

= 122

The answer is positive

(b) 87 + (-163)

= 87 - 163

= -76

The answer is negative

(c) - 35.7 + 22.9

= -12.8

The answer is negative

(d) 8.79 + 6.41

= 15.20

The answer is positive

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A flower bed has the shape of a rectangle 5 yards long and 4 yards wide. what is its area in square feet? be sure to include the correct unit in your answer.

Answers

Answer: 60 square feet

Step-by-step explanation: 5 times 4= 20 yards 20 times 3=60 feet

5*3=15

4*3=12

15*12= 180square feet

What is the area of the circle shown below?
A circle with radius 8 centimeters.
a.
8 pi cm2
c.
StartFraction 16 Over 3 EndFraction pi cm2
b.
16 pi cm2
d.
64 pi cm2

Answers

Answer:

Step-by-step explanation:

64 pi cm2

Answer:

201.1 = 8^2 pi cm2 = 64 pi cm2

Step-by-step explanation:

The area of a circle with a radius 8 is 201.1

Hope it helps!!!

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all answers needed please help i’ll give brainliest !! this is due tmr

Answers

Answer: See below

Step-by-step explanation:

a. 3(4)= 12

b. 4+11+(-4)

   =15+(-4)

Answer=11

c. 3.2(2)= 6.4

d. I (-2)+(-2)+(-2) I=  6

e. I 2(-7.5) I = 15

f. [tex]10\frac{1}{5}[/tex](-5)= -51


Colin is borrowing money from his parents to purchase a $700
computer. He will pay them $35 per month for two years. Determine the
simple interest rate on Colin's loan.

Answers

Colin paid the loan at a ten percent annual interest rate.

Simple interest is the form of interest calculation in which the principal amount remains the same for the entire duration for which the loan is taken.

It is also assumed that Colin will repay $35 per month for the next two years.

We must calculate a simple interest rate on Colin's borrowings.

As a result, Colin's total payment to his parents for two years is $35.

We are required to find simple interest rate on Colin's borrowings

Therefore, total amount paid by Colin to his parents= 35$ for 2 years

        =35*24=840

The amount paid by Colin is principal + interest

Thus, the simple interest amount= 840-700=140$

We know that the simple interest formula is principal*rate*time/100.

We know that the simple interest is 140, the principal is 700, the time is two years, and we need to find the rate of interest.

SI= P*R*T/100

140= 700*R*2/100

140/7*2=R

R=140/14=10

Therefore, The Rate of interest on which Colin paid the loan is 10 per cent per annum

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Which of the following real numbers should be subtracted from -5 to get a difference of 0?


A.
-10


B.
-5


C.
0


D.
5

Answers

The real number that should be subtracted from - 5 to get 0 is -5 (option b).

What is the real number?

A real number is a quantity that can be written as an infinite decimal expansion. A real number is made up of both rational numbers and irrational numbers.

Rational numbers are numbers that can be expressed as a fraction of two integers. An example is 5, -5.  Irrational numbers cannot be expressed as a fraction of two integers. An example is 22/7, 1/3.

In mathematics, the following rules exist:

a negative number multiplied by a negative number yields a positive number. a negative number multiplied by a positive number, yields a negative number. a positive number multiplied by a positive number yields a positive number.

-5 - (-5)

= -5 + 5

= 0

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Solve the formula for the specified variable.
F

Answers

[tex]D=\frac{1}{5}kf \\ \\ 5D=kf \\ \\ \boxed{f=\frac{5D}{k}}[/tex]

In a discount clothing​ store, all sweaters are sold at one fixed price and all shirts are sold at another fixed price. If one sweater and four shirts cost ​$47​, while four sweaters and three shirts cost ​$84​, find the price of one sweater and the price of one shirt.

Answers

Answer:

Step-by-step explanation:

Let x be the sweater

Let y be the shirt

Equation1:    x+4y=47

Equation2:    4x+3y=84

Now solve for x in the first equation:

x+4y=47

x=47-4y

Now that we've solved for x, substitute the value for x which is 47-4y into Equation2 as follows:

4x+3y=84

4(47-4y)+3y= 84

188-16y+3y= 84

188-13y= 84

-13y= 84-188

-13y= -104

y= -104/-13

y= 8

Now plug in the value for y which is 8 into Equation 1 and solve for x:

x+4y=47

x+4(8)=47

x+32=47

x=47-32

x=15

You can perform a check by plugging in the x and y values into equations 1 and 2 which should yield true statements.

The answer is: 1 sweater costs $15 and 1 shirt costs $8

A polling company reported that 98% of 2,330 surveyed adults said that they play football. What is the exact value that is 98% of 2,330?

Answers

The exact value that is 98% of 2330 is 2283

The value is 98% of 2330

98% of 2330 is 98/100×2330=2283.4≅2283

The Latin word "per centum," which meaning "by the hundred," was the source of the English word "percentage." Fractions with a denominator of 100 are called percentages. In other words, it is a relationship where the value of the entire is always assumed to be 100.Percentage is a fraction or a ratio in which the value of whole is always 100. Percent is another name for indicating hundredths.The percentage formula is used to find the share of a whole in terms of 100

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perpendicular to y=-1/3x-6 through (-2,8)

Answers

Answer:

y = 3x + 14

See the work below.

Step-by-step explanation:

During a Brazilian Day celebration, dancers perform in groups to honor Brazil's independence. There are 56 dancers wearing green outfits and 42 dancers wearing yellow outfits. Each group of dancers has the same number of dancers wearing green and the same number of dancers wearing yellow. All of the dancers are in a group. What is the greatest number of groups that can be formed?​

Answers

The greatest number of groups that can be formed is 7.

How to calculate the value?

It should be noted that there are 56 dancers wearing green outfits and 42 dancers wearing yellow outfits.

The greatest number of groups that can be formed will the highest common factor between the numbers.

It should be noted that the highest common factor between 42 and 56 is 7.

Therefore, the greatest number of groups that can be formed is 7.

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