Somebody help me pls.

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

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation