Pls help me with this math

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.

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

In a rectangle klmn, km = 6x + 16 and ln = 49. find the value of x