A hotdog vendor has initial start-up costs of 6700 and an item charge of 0.60 per combo meal. What is the cost function?
a) C(x) = 0.60x
b) C(x) = 6700 + 0.60x
c) C(x) = 6700 - 0.60x
d) C(x) = 6700x + 0.60