Jack wants to cook three microwave pizzas for himself and his two sisters at the same time. The instructions on the box say to cook one pizza for four minutes and add three minutes for each additional pizza. Which of the following is a function that describes the relationship between x, the number of pizzas being microwaved, and f(x), the total time it takes to cook x pizzas.
A. f(x) = 3x + 1
B. f(x) = 4 + 3x
C. f(x) = 4 (x + 3)
D. f(x) = 4 (3x + 1)

Question

Jack wants to cook three microwave pizzas for himself and his two sisters at the same time. The instructions on the box say to cook one pizza for four minutes and add three minutes for each additional pizza. Which of the following is a function that describes the relationship between x, the number of pizzas being microwaved, and f(x), the total time it takes to cook x pizzas.
A.	f(x) = 3x + 1
	B.	f(x) = 4 + 3x
	C.	f(x) = 4 (x + 3)
	D.	f(x) = 4 (3x + 1)