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?