How to add and subtract mixed number

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.

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²