Red apples cost $$1.20$ per pound and green apples cost $$1.50$ per pound.

1. Write an expression to represent the total cost of $x$ pounds of red apples and y pounds of green apples.

   Answer (a):

   $1.20x + 1.50y$

2. What is the total cost if you buy $3$ pounds of red apples and $2$ pounds of green apples?

   Hint (b):

   Substitute $3$ for $x$ and $2$ for $y$.

   More Help (b):

   $1.20(3) + 1.50(2) =$
   $3.60 + 3.00 =$
   $\$6.60$