I need the answer of homework 4 of math 131

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

How much orange juice do you need to make 2 servings of lemony orange slush?

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.