Question

A pen is being built that is 10 feet long and 20 feet wide. How much fencing material will be needed?

Answer 1

This is a perimeter problem. The equation for the perimeter is:
$p = 2l + 2w$
where l = length of the rectangle (10ft) and w = width of the rectangle (20ft). Put the numbers into the equation and solve for perimeter!

$p = 2(10) + 2(20) = 60$

The answer is D) 60 ft.