What is the expression written using each base only once? (-4)^-6 * (-4)^7 a. 4^13 b.-4 c.13 d.1 find the simplified form of expression. give your answer in scientific notation. (3 x 10^6) (8 x 10^-4) a. 1.1 x 10^3 b.2.4 x 10^3 c.1.1 x 10^-23 d.2.4 x 10^-23

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?