Write as an equation: the sides of a triangle are 7, x and (x + 1). the perimeter is 30.

a. 30 =7+ (x+1)
b. 30 - 7 = 2x
c. 30 = 7 + 2(x + 1)
d.30 = 8+2x

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?