first box - $2.90 per pound
second- $2.50 per pound
third- $2.98 per pound
fourth- $2.00 per pound
Y=4/3 because if 3 goes to rhs is becomes divided by the number on the rhs so answer is 4/3
The original area of a face would be a^2. Now that you added b to the edge, the new area of each face would be (a+b)^2. To find how much the are increased, subtract a^2 from (a+b)^2.
So the answer is b(2a+b)
This problems needs an image!!