Question

A rectangle has a perimeter of 84 meters. One dimension is 7 meters. How long is

Answer 1

Answer:

The unknown dimension is 35

Step-by-step explanation:

The perimeter of a rectangle is l+l+w+w or 2l+2w (l=length, w=width)

$l+l+w+w=84$

$7+7+w+w=84$

$14+w+w=84$

then we subtract 14 from 84

$w+w=70$

$2w=70$

$\frac{70}{2}=35$

$w=35$

Let's check our answer

$35+35+7+7=84$

Hope this helps :-)