Question

The width of a rectangle is 5 n minus 1.5 feet and the length is 1.5 n plus 9 feet. Find the perimeter of the rectangle.

Answer 1

`Perimeter= 13n+15`

Explanation:

We know that

Length(l) = 1.5n + 9 ft

Width(w) = 5n - 1.5 ft

The formula for the perimeter(P) of a rectangle is:

`P=2l+2b \\or \\P=2(l+b)`

So by substituting l and w we get :

`P= 2[(1.5n+9)+(5n-1.5)]`

`P= 2[(1.5n+9)+(5n-1.5)]`

`P= 2[1.5n+5n+9-1.5]`

`P= 2[6.5n+7.5]`

`P= 13n+15`