Find the value of x that solves the system shown below.
y = 5x
2x - y = 18

Answer:

810 boys

Step-by-step explanation:

1800 students and 55% are girls.

100%-55%=45%

1800*0.45 = 810

1800*0.55 = 990

So there are 990 girls and 810 boys.

Hope this helps :)

Answer:

dhdhrjfidgegehfr fhfn fhc fn dncc c. f byn

Step-by-step explanation:

h(t) = -16t² + 64t + 32

When h(t) = 80, -16t² + 64t + 32 = 80.

=> 16t² - 64t + 48 = 0

=> t² - 4t + 3 = 0

=> (t - 1)(t - 3) = 0

=> t = 1 or t = 3.

Hence the difference between the times is 2 seconds. (B)

Answer:

The length of the hypotenuse: c = 96.8 units

Step-by-step explanation:

Given the sides

Given that the x = 12

so

Pythagorean Theorem:

For a right angled triangle with sides 'a' and 'b', the hypotenuse 'c' is defined as:

[tex]c=\sqrt{a^2+b^2}[/tex]

substituting a = 76 and b = 60

[tex]c=\sqrt{76^2+60^2}[/tex]

[tex]c=4\sqrt{586}[/tex]

[tex]c = 96.8[/tex] units

Therefore, the length of the hypotenuse: c = 96.8 units

Answer:

Step-by-step explanation:

Step 1: We make the assumption that 160 is 100% since it is our output value.

Step 2: We next represent the value we seek with x.

Step 3: From step 1, it follows that 100%=160

Step 4: In the same vein, = x%=140​.

Step 5: This gives us a pair of simple equations:

100%=160(1)​.

x%=140(2)​.

Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS

(left hand side) of both equations have the same unit (%); we have

100% / x% = 160 / 140

Step 7: Taking the inverse (or reciprocal) of both sides yields

x% / 100% = 140 / 160

x% = 87.5%

therefore, 140 is 87.5% of 160

We obtain that 140 is 12.5% percent less than 160.

A percentage is a value per hundredth. Percentages can be converted into decimals and fractions by dividing the percentage value by a hundred.

Given, 140 is some percent less than 160 to obtain this we'll subtract (140/160)×100% from 100% which is,

= 100% - (140/160)×100%.

= 100% - 87.5%.

= 12.5%

learn more about percentages here :

https://brainly.com/question/24159063

#SPJ2

Answer:

B

Step-by-step explanation:

right on edge 2020

Answer: i think it is b correct me if i am wrong

Step-by-step explanation:

Answer:

6.25

Step-by-step explanation:

Answer:

[tex]ab-2bc+ca[/tex]

Step-by-step explanation:

Complete question is given below

Add:-

ab-bc+ac,bc-ca+ab,ca-ab-2bc

We have to find the result after addition

Now, adding all expression

We get

[tex]ab-bc+ac+bc-ca+ab+ca-ab-2bc[/tex]

Combine like terms then, we get

[tex](ab+ab-ab)+(bc-bc-2bc)+(ac-ca+ca)[/tex]

[tex]ab-2bc+ca[/tex]

Hence,[tex]ab-bc+ac+bc-ca+ab+ca-ab-2bc=ab-2bc+ca[/tex]

Answer:

Aerobic

Step-by-step explanation:

Oxygen = aerobic

no oxygen = anaerobic

Answer:

She had sold 24 shirts.

Answer:

24 shirts.

Step-by-step explanation:

Let the number of shirt she sold = x.

4x - 25 = 71

4x = 96

x = 24.

Answer:

$3.95

Step-by-step explanation:

12*0.25=3

4*0.10=0.40

11*0.05=0.55

3+0.40+0.55=$3.95

Answer:

$3.95

Step-by-step explanation:

12q+4d+11n

Answer:

What’s the question?

Step-by-step explanation:

Answer:

1= 0.25feet per 1 second

2.= 120 seconds

3. 72 seconds or 1 minute 12 seconds

Step-by-step explanation:

1.= 2/8=1/4=.25

2.= 50-20=30

30/.25=120

3.= 18 feet/.25 feet= 72 seconds

Answer:

1= 0.25feet per 1 second

2.= 120 seconds

3. 72 seconds or 1 minute 12 seconds

Step-by-step explanation:

Answer: = -3x^3 + 4x^2

Step-by-step explanation:

Answer:

-3x^3 + 4x^2

lmk if this helps

Answer:

(In order, top to bottom. )

Definition of a rectangle

opposite sides of a rectangle are congruent

reflexive property of congruence

SAS congruence postulate

Step-by-step explanation:

Parallelogram JKLM is a rectangle and by definition of a rectangle, ∠JML

and ∠KLM are right angles, ∠JML ≅ ∠KLM because, all right angles are

congruent, ≅ because opposite sides of a parallelogram are congruent, and ≅ by reflective property of congruence. By the SAS

congruence postulate, ΔJML ≅ ΔKLM.

congruent parts of congruent triangles are congruent, ≅

The given quadrilateral is a parallelogram, that have interior angles that are right angles, therefore, the figure has the properties of a rectangle, and

parallelograms including the length of opposite sides are equal, all right angles are congruent and equal to 90° and the length of a side is equal to itself by reflexive property, & ≅

The Side-Angle-Side SAS postulate states that if two sides and an included

angle of one triangle are congruent to the corresponding two of sides and

included angle of another triangle, the two triangles are congruent.

Answer:

Heeeheeeeheee

Step-by-step explanation:

So right

Answer:

im blind

Step-by-step explanation:

im really sorry i cant see anything

Answer:

It is A or 3.9

Step-by-step explanation:

PLEASE GIVE BRAINLIEST

its just the square route.

Answer:

15

Step-by-step explanation:

x = time in weeks

y= dollars

so once x hits 0 they corresponding y will be the y intercept.

Answer:

Answer is in photo

Step-by-step explanation:

Answer:

105

Step-by-step explanation:

t = 0

frame = 190

so it means, the video has 190 before the timer start counting

speed 25 fps

-------

t = -3 2/5 s = -17/5 s

frame = ?

with the rate of 25 fps

it gain 25 x -17/5 = 85 frame.

so the video at that time has already played

190-85 = 105 frame

Answer:

huh?

Step-by-step explanation:

Note: your equation is a little bit unclear. Thus, I am assuming that

y = 2x+5

Anyway, the procedure remains the same. It would anyways clear your concept.

Answer:

We conclude that the ordered pair (2, 1) is a solution.

Step-by-step explanation:

Given the equation

[tex]y = -2x+5[/tex]

Check for point (2, 1)

substituting the point (2, 1) in the equation to check whether the ordered point satisfies the equation or not.

[tex]y = -2x+5[/tex]

plug in x = 2 and y = 1

1 = -2(2)+5

1 = -4+5

1 = 1

R.H.S = L.H.S

TRUE

Therefore, the given ordered pairs satisifes the equation.

Hence, we conclude that the ordered pair (2, 1) is a solution.

Answer:

ok

Step-by-step explanation:

Option C. Please mark me as brainliest.

Answer:

Step-by-step explanation:

Thank you for the note. You show what you want like this.

X/3 + (x - 1)/4 = 2+X         Multiply both sides by 12.

[tex]\frac{12*x}{3} + \frac{12*(x -1)}{4} = 12(x + 2)[/tex]

Now take mini steps.

1. Divide 3 into 12

4x

2. Divide 4 into 12

3(x - 1)

========================

Here's what you have.

4x + 3(x - 1) = 12(x + 2)                        Remove the brackets.

4x + 3x - 3 = 12x + 24                         Combine like terms

7x - 3 = 12x + 24                                 Subtract 7x from both sides.

- 3 = 12x - 7x +24

-3 = 5x + 24                                        Subtract 24 from both sides.

-27 = 5x                                              Divide by 5

x = -5.4

Answer:

The new balance in Sean's account is $203.65

Step-by-step explanation:

The initial balance in Sean's account is $328.15. Then he writes checks for the amounts $20.75, $43.58, $30.45, and $29.72.  

The sum of his checks is $20.75 + $43.58 + $30.45 + $29.72 = $124.5

The new balance in Sean's account is the initial balance minus the sum of the amounts of the checks he wrote:

Final balance = $328.15 - $124.5 = $203.65

The new balance in Sean's account is $203.65

Step-by-step explanation:

A)At the end of 2years compound interest=$150(1+4/100)²=$162.24

i) Amount difference=$328.67-{($150×4×20/100)+$150}

=$328.67-$270=$58.67

ii)328.67/150×100%=121.73%

Answer:

[tex]\displaystyle g'(10)=\frac{1}{-13}=-\frac{1}{13}[/tex]

Step-by-step explanation:

The Derivative of the Inverse Function

Let f(x) be a real invertible function, and g(x) the inverse function of f(x), i.e.,:

[tex]g(x)=f^{-1}(x)[/tex]

We can calculate the derivative of the inverse function even if we don't have the inverse function explicitly computed. We use the formula:

[tex]\displaystyle g'(x)=\frac{1}{f'(g(x))}[/tex]

We need to find the value of g'(10) when:

[tex]f(x)=-x^3-x[/tex]

Substituting:

[tex]\displaystyle g'(10)=\frac{1}{f'(g(10))}[/tex]

We don't have the value of g(10) but we can guess its value since the inverse functions f and g satisfy:

if y=f(x), then g(y)=x, thus we need to find a value of x that produces a value of f(x)=10.

We can easily find that x=-2:

[tex]f(-2)=-(-2)^3-(-2)=8+2=10.[/tex]

Thus, g(10)=-2

Now we find:

[tex]f'(x)=-3x^2-1[/tex]

[tex]f'(-2)=-3(-2)^2-1[/tex]

[tex]f'(-2)=-3*4-1=-13[/tex]

Thus, finally:

[tex]\displaystyle g'(10)=\frac{1}{-13}=-\frac{1}{13}[/tex]

Answer:

[tex]p - q = 3 \sec\theta - (3 { \tan}^{2} \theta - 1) \\ = 3 \sec \theta - 3 { \tan}^{2} \theta + 1 \\ from \: identities \: \: { \tan }^{2} \theta + 1 = { \sec }^{2} \theta \\ = 3 { \sec } \theta - 3( { \sec }^{2} \theta - 1) + 1 \\ = 3 \sec\theta - 3 { \sec}^{2} \theta + 3 + 1 \\ = - 3 { \sec }^{2} \theta + 3 \sec\theta + 4 \\ = - 3( { \sec}^{2} \theta - \sec \theta - \frac{4}{3} )[/tex]

Answer:

7

Step-by-step explanation:

Pythagorean theorem. 24^2+b^2=25^2

Simplify

576+b^2=625

b^2=49

b=7