Hi I could use some help on these questions. Suppose a Kindel manufacturer has the total cost function C(x) = 145X + 26500 and the total revenue

Hi I could use some help on these questions.

Suppose a Kindel manufacturer has the total cost function

                                    C(x) = 145X + 26500

and the total revenue function

                                    R(x) = 255X

where x is the number of Kindels.

 -Find C(15)

-What is the equation of the profit function for this commodity?