It took Mrs. Harpole 35 minutes to grade
four student essays. How long will it take
her to grade all her classes, 80 students?

Answer:

SSS

Step-by-step explanation:

it means side side side and the lines represent their congruecny with the other triangle, meaning that the two line dash is equal to the other two line dash and the one line dash is equal to the other one line dash and you know the last side is the same with eachother because they are sharing that side of the triange

hope it helps have a great day

im not having a great day i got 101 notifications. guess what they were. A MODERATOR DELETED ALL MY ANSWERS AND NOW I HAD TO START OVER I HAD 23 BRAINLIESTS AND 2983 POINTS AND NOW I HAVE -76 POINTS

Answer:

There were 35 children and 38 adults at the pool that day.

Step-by-step explanation:

You can use substitution to solve this answer. When solving equations with substitution, ask yourself "how many?" and "how much?" to create two equations:

1.25c+2.25a=126.25  (this equation tells us the dollar value)

c+a=73.   (this equation tells us quantity, or how many)

1. Solve for 1 variable and plug it into the other equation.

a=73-c   -----> 1.25c+2.25(73-c)=126.25

2. Simplify the equation above.

1.25c+164.25-2.25c=126.25

3. Simplify even more:

-1c+164.25=126.25

4. Subtract 164.25 from both sides to get:

-1c=-38

5. Divide both sides by -1.

c=38 (this means that there are 38 children)

6. Plug the new value for c back into the equation c+a=73.

38+a=73

7. Subtract 38 from both sides to solve for a:

a=35 (this means that there are 35 adults)

I hope this helps!

Answer:

a) the platform is 110 feet above the ground.

b)  It takes 8.69 sec for the rock to hit the ground

Step-by-step explanation:

This situation is modelled by the following function: [tex]f(x) = -5x^2 + 40x + 30\\[/tex]

We need to answer the following questions.

a) How high above the ground is the platform?

First we find x using the formula: [tex]x=-\frac{b}{2a}[/tex]

we have b = 40 and a = -5

Putting values and finding x

[tex]x=-\frac{b}{2a}\\x=-\frac{40}{2(-5)}\\x=-\frac{40}{-10}\\x=4[/tex]

Now putting x=4 in the function to find how high above the ground is the platform

[tex]f(x) = -5x^2 + 40x + 30\\Put\:x=4\\f(4)=-5(4)^2+40(4)+30\\f(4)=-5(16)+160+30\\f(4)=-80+160+30\\f(4)=110[/tex]

So, the platform is 110 feet above the ground.

b) How long does it take for the rock to hit the ground? Show all work to receive full credit!

We will factorise the given function [tex]f(x) = -5x^2 + 40x + 30[/tex] to find the time taken to hit the ground.

We can solve the equation using quadratic formula: [tex]x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]

We have a =-5, b=40, c=30

Putting values and finding x

[tex]x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\\x=\frac{-40\pm\sqrt{(40)^2-4(-5)(30)}}{2(-5)}\\x=\frac{-40\pm\sqrt{1600+600}}{-10}\\x=\frac{-40\pm\sqrt{2200}}{-10}\\x=\frac{-40\pm46.9}{-10}\\x=\frac{-40+46.9}{-10},x=\frac{-40-46.9}{-10} \\x=-0.69,x=8.69[/tex]

So, we get values of x: x = -0.69 and x=8.69

As time cannot be negative, so we take x=8.69

So, It takes 8.69 sec for the rock to hit the ground

Answer:

343

Step-by-step explanation:

the answer is that you add all of them

Answer:

33

Step-by-step explanation:

just coint how much is on each side then multiply it by 3

Answer:

x = -1/7

Step-by-step explanation:

Solve for x

9-17x-5-4x=7

Combine like terms

-21x +4 = 7

Subtract 4 from each side

-21x-4+4 = 7-4

-21x = 3

Divide each side by -21

-21x/-21 = 3/-21

x = -1/7

Check

9 - 17(-1/7) -5 -4(-1/7) =7

9 + 17/7 -5 + 4/7 =7

4 +21/7 = 7

4+3 = 7

7=7

Answer:

I believe the answer is C

Step-by-step explanation:

Answer:

B. The rate of change of the cost of the taxi ride is $3.00 per minute.

Step-by-step explanation:

The slope is 3 so it is $3 per minute (x) and $2 is the flag down cost.

Answer:

d

Step-by-step explanation:

hope this helps

The quadrant of P' is (-3 , 2).

Here,

Point P is located at (–3, –2).

Point P is reflected across the x-axis to create P'.

We have to find the quadrant of P'.

What is Reflection across x-axis?

A point after reflection across the x-axis, the x- coordinate remains the same but y - coordinate is taken to be the additive inverse.

Now,

Point P is located at (–3, –2).

Point P is lie on third coordinates.

And, P is reflected across the x-axis to create P'.

Hence, Point P' is lie on second coordinates.

Since, The rule of the reflection across x- axis is,

(x, y) → (x, -y)

Hence, Quadrant of P' = (-3, -(-2)) = (-3, 2)

Therefore, The quadrant of P' is (-3 , 2).

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Answer:

X=18

Step-by-step explanation:

Answer: 18

Step-by-step explanation:

we know that 6x+10 is equal with the angle above the one that is measured (5x-28)

we have 6x+10+5x-28=180 (a straight line)

11x=180+28-10

11 x=198

x=18

Answer:

300yd²

Step-by-step explanation:

Surface Area = area of triangles *2 + area of thhe 3 rectangles

SA= 2*( 9*4/2) + 5*12 + 8*12 + 9*12=  2*18 +5*12 + 8*12 + 9*12 =

36+60+96+108 = 300

Coordinates of L after rotation are  (-8,4)

What are the rules of 270 degrees rotation of coordinates about the origin?

Assuming that the rotation is about  (0,0)

then after 270° clockwise rotation (x, y) becomes (-y, x)

and after 270°  anticlockwise rotation (x, y) becomes (y,-x)

Given that LMN with vertices L(4,8), M(4,3) and N(8,8) is rotated  270°  clockwise about the origin

Then for L(4,8) as the rotation is  270°  clockwise then  

(x, y) = (4,8)

and after 270° clockwise rotation (x, y) becomes (-y, x)

Therefore new coordinates of L are (-8,4)

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Answer: -3x-7

Step-by-step explanation:

First, remove the parentheses,

Then. simplify

Answer:

C

Step-by-step explanation:

Answer:

D

Step-by-step explanation:

I am trying to get 100 warns, pls help me

Answer:

-11

Step-by-step explanation:

Answer:

25 meals

Step-by-step explanation:

If Rita feeds her dog 2/5 pounds of dog food for each meal, this means;

2/5 pounds = 1 meal

To get the number of meals she will feed if she buys 10 pounds, we will say;

10 pounds = x meals

Divide both equations to get x;

(2/5)/10 = 1/x

Cross multiply;

2/5 x = 10 * 1

2x/5 = 10

2x = 50

x = 50/2

x = 25

Hence the 10pounds food will last 25 meals

The wide is the gym in the drawing is 5

In the given statement is

Cassie measured the middle school and made a scale drawing. The scale of the drawing was 1 inch : 9 feet. the actual width of the gym is 45 feet.

To find how wide is the gym in the drawing

Now, According to the question

and, Based on the given conditions

=45 x1/9

=45/9

=5

Thus, The wide is the gym in the drawing is 5

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Answer:

2) Mia needs to buy 3 packages of noisemakers

3)Mia needs to buy 4 packages of hats

4)Mia will dpend a total of $66

Answer:

-62

Step-by-step explanation:

In this question, we are going to solve the given expression.

We know that our f(x) equation is (-7)x - 3

Since we have to find what f(4) is, we would plug in 4 to x and solve.

Solve:

f(4) = -7(4) - 3

= -28 - 3

= -31

We are not done, we have to plug in our answer to the expression f(4 + f(4), since we now know what the value of f(4) is.

-31 - 31

-62

Your answer would be -62.

Answer:

x = 5.

Step-by-step explanation:

x is the radius of the circle.

The line of length 4 bisects the chord of length 6 into 2 line segments of length 3.

If we draw a line from the centre to where the chord of length 6 meets the circle we have another radius.

This is also the hypotenuse (h) of a right triangle, so we have a right triangle whose legs are 3 and 4, then:

h^2 = 4^2 + 3^2 = 25

h = 5

x = 5 (as x and h are both radii).

9514 1404 393

Answer:

  3.  62.5% decrease

  4.  26.2% decrease

  5.  13.2% decrease

Explanation:

A percentage change is calculated from ...

  percent change = ((new value) - (old value))/(old value) × 100%

When it is negative, the change is a decrease.

__

3. (24 -64)/64 × 100% = -40/64 × 100% = -62.5%, a 62.5% decrease

__

4. (4.8 -6.5)/6.5 × 100% = -1.7/6.5 × 100% ≈ -26.2%, a 26.2% decrease

__

5. (1.12 -1.29)/1.29 × 100% = -0.17/1.29 × 100% ≈ -13.2%, a 13.2% decrease

Answer:

C. x = 1 + 3i or x = 1 - 3i

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Algebra I

Algebra II

Step-by-step explanation:

Step 1: Define

x² - 2x + 10 = 0

Step 2: Identify Variables

a = 1

b = -2

c = 10

Step 3: Find roots

Answer:

Imagine it is an alligator's mouth, the opening side eats the larger number because the alligator would want to eat the greater number then the less one, well, that's how I learned it.

-----____----____-----_____----____-----______------______-----_______-----___

Answer:  I would post the answers in comment am unable to add the answer.

Step-by-step explanation:

1.F is the midpoint of AC, angle AFE =  angle CFD and DF = EF  (Given)

2.angle AFD =  angle CFE  ( A midpoint divides a segment into two congruent segments.)

3.angle DFE = angle DFE (Reflexive property)

4.angle A =  angle C (Congruent angles subtracted from congruent angles form congruent angles )

Answer:

Step-by-step explanation:

C

Answer:

A.

Step-by-step explanation:

If you look closely you can see that A is the only one with 50-59 shaded up to 5 frequency and the other data is correct as well.

Answer:

b

Step-by-step explanation: