Percent means parts out of 100
70%=70/100=7/10
7/10 of x=28
'of' means multiply
7/10 x=28
multiply both sides by 10/7 to get rid of fraciton
x=40

the number is 40

5 0

3 years ago

Read 2 more answers

A ball is dropped from a height of 64 feet. Its height, in feet, can be modeled by the function h(t) = -167 + 64, where t is the

Oliga [24]

Answer:

Step-by-step explanation:

Known facts:

the ball dropped from a height of 64 feet
function $h(t) = -16t^{2} + 64$

First question:

the ball hits the ground when h(t) = 0, thus we get the equation

$-16t^{2} +64 = 0\\16t^{2} = 64\\t^{2} =4\\t = 2$

So the ball hits the ground in 2s

Second question

to find how long it takes the ball to fall 36 feet, we must set h(t) = 64 - 36 = 28

$-16t^{2} +64 = 28\\16t^{2} = 36\\t = \frac{6}{4} =1.5s$

So the ball hits the ground in 1.5s

Hope that helps!

3 0

2 years ago

What are the solutions of the equation 2x2 = 2?

kkurt [141]

$2x^2=2\ \ \ |divide\ both\ sides\ by\ 2\\\\x^2=1\to \boxed{x=-1\ or\ x=1}$

3 0

3 years ago

Please help me with this

jeka57 [31]

Answer:

1) they equation they solved was correct as they were able to do the correct operation to yield their answer.

2)this problem should be approached by subbing in the correct X values and y values into their rightful position, by doing this U will yrild the correct answer

8 0

2 years ago