Fridge pre-calc question

Question

A company manufactures small refrigerators. The total cost to manufacture 81 refrigerators is $6075. The total costs to manufacture 178 refrigerators is $12380. Assume that total cost, C, is linearly related to the number of refrigerators, x, the company manufactures and includes a fixed cost and a cost per refrigerator.

I have the equation as C(x)=65(x)+810

C) The fixed costs are $

D) The cost to produce each additional refrigerator is

Answer 1

Your equation is right.

C) The fixed coct we get if x = 0 so fixed cost is C(0) = $810

D) C(x + 1) - C(x) = $65 per unit