algebra
posted by Ann .
Synthesis: Find a polynomial for the shaded area of each figure. 21t+8 is on top of the outer box and 4t is on the left side of the outer box. On the inter box there is 3t4 and 2t on the left side of the inter box. the area between the outer box and the inter box is shaded. I am having trouble with this problem and can't quite get it right.

(21t+8)(4t)  (3t4)(2t) = 78t^2 + 40t