Cary is 5 5 years older than dan. in 5 years the sum of their ages will be 81. find the age of each man now.

C = Cary, D = Dan
C - 55 = D
(C + 5) + (D + 5) = 81
C = D + 55
(D + 55 + 5) + (D + 5) = 81
(D + 60) + (D + 5) = 81
2D = 16
D = 8
C = 8 + 55 = 63

Cary is 63 years old, and Dan is 8 years old

Area of the triangle is base x height, divided by 2, so that is (8 x 10= 80 divided by 2, which is 40.
area of the rectangle is base x height, so that is 3x2= 6
so 40-6 is the area of the shaded region.
so 34 meters squared is your answer.

(length x width x height) x 4$
  (16 x 14 x 3) x 4 = cost
  cost = 2688$