Exercise30

A rectangular frame’s perimeter is \(8.6\) feet. If its length is \(2.5\) feet, suppose we want to find how long is its width. A rectangle’s perimeter formula is

\(\displaystyle{P=2(l+w)}\text{,}\)

where \(P\) stands for perimeter, \(l\) for length and \(w\) for width. We can solve this problem using the equation:

\(\displaystyle{8.6=2(2.5+w)}\text{.}\)

Check whether \(1.8\) is a solution for \(w\) of this equation.

in-context