What is 3 + p = 9(1/3)?

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

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

Icould really use some with this question.