Question

The length of a rectangle is 3n+2 and it’s width is n-1. The perimeter of the rectangle is twice the sun of its length and width. Find the perimeter when n=4 inches

Answer 1

Length, L = 3n + 2

Width, W = n - 1

Perimeter, P = 2*(L + W)

= 2*( 3n + 2 + n - 1)

= 2*(3n + n + 2 - 1)

= 2*(4n + 1)

= 2*4n + 2*1

= 8n + 2

Perimeter = (8n + 2)

Perimeter, when n = 4, 8n + 2 = 8*4 + 2 = 32 +2 = 34

Perimeter = 34 inches.