ASAP please! I have to get this done to get my grades up! If f(x) = x2 - 3x + 5 and g(x) = 3x. Find the product of the functions.

A) (f · g)(x) = x2 + 5
B) (f · g)(x) = 3x2 - 9x + 15
C) (f · g)(x) = 3x2 - 6x + 15
D) (f · g)(x) = 3x3 - 9x2 + 15x

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.

Ineed someone to me answer my question i have to have this done and knocked out

The area of a circle is equal to 1 dm². find the radius of the circle.