Apples are on sale for $1.79 per pound. mary bought apples and gave the clerk a coupon for 50 cents off. write an equation that describes the total cost, t, as a function of the pounds of apples, p, purchased (do not include tax). t(p) = 1.79p-.50 how many pounds did she buy if the cost was $3.08? what was the total cost to the cent if she bought 2.5 pounds of apples? how many pounds did she buy if the cost was $6.66?