A hardware store want to mix sand worth $8 per pound with sand worth $4 per pound to get an 80 pound mixture that is worth $5 per pound. How many pounds of each type of sand should be used?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

The mass of a marine organism, in pounds, p years after it is born is given by the polynomial function r(p) = -4p2 + 300p. find the mass when p = 20 years.

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?