Mary lives 1 3/4 km from school. She rode her bike to school and back each day for 5 days. Which expression shows how to estimate the number of km she rode on her bike? A) ( 5+2 ) x 2
B) 5x (2+2)
C) (7+2) x2
D) 7x (2+2)

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:

x-150=475   x=625

step-by-step explanation:

if the bike after the sale ($150) is $475 then just simply add 150 to 475.