Question

The area is 21in^2. Write an equation and use it to find the value of D.

Answer 1

Given figure is a rectangle.

The rectangle is of length d in and width 3 in.

Therefore, its area is 3d square inches.

Accordingly,

`\begin{gathered} 3d=21 \\ d=7 \end{gathered}`

Hence, the value of d is 7.