Question

A rectangle has length c and width 2d. Another rectangle has length 4 and width (5-c). Write a simplified expression of their combined area.

Answer 1

The combined area is area of the first rectangle plus area of the second rectangle.
Area of first rectangle = c x 2d = 2cd
Area of second rectangle = 4(5 - c) = 20 - 4c

Combined area = 2cd + 20 - 4c