Please I need help in solving this questions:

(1)

What is the maximum vertical distance between the liney=x+20

and the parabolay=x²for4x5?

(2)

A farmer wants to fence an area of13.5million square feet in a rectangular field and then divide it in half with a fence parallel to one of the sides of the rectangle. What should the lengths of the sides of the rectangular field be so as to minimize the cost of the fence?

__________ft (smaller value)

__________ft (larger value)

(3)

The graph offis shown. Evaluate each integral by interpreting it in terms of areas.

(a) Integral 0 to20 f(x)dx

(b)Integral 0 to50 f(x)dx

(c)Integral 50 to70 f(x)dx

(d)Integral 0 to90 f(x)dx

Thanks