You have a new 10-day workout routine. You want to do 10 sets of 10 sit-ups each day. Which expression shows the total number of sit-ups you do in 10 days?
1.)10^3
2.)10+10+10
3.)10^2
4.)3x10

4.

Step-by-step explanation:

Im sorry if im wrong but i think 4

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

f is the midpoint of