The revenue R(x) (in thousands of dollars) that a company receives from the sale of x thou...

The revenue R(x) (in thousands of dollars) that a company receives from the sale of x thousand units is given by R(x) = 5x-x2 . The sales level x is in turn a function f(d) of the number d of dollars spent on advertising, where

Express the revenue as a function of the amount spent on advertising.