Can somebody help with these questions?

One integer is 8 times another. if the product is 72, then find the integers

The length of a rectangle is x times the square root of 100. the width is one-half y more than three-halves x. given that the area of the rectangle is 125 cm2, which equation could represent the rectangle in terms of x and y? a) 5xy − 15x = 125 b) 5xy + 15x = 125 c) 15x2 − 5xy = 125 d) 15x2 + 5xy = 125

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2