Question

1. perimeter of a rectangle

solve for $ell$: $p = 2ell+2w$

Explanation:

Step1: Isolate the term with $\ell$

Subtract $2w$ from both sides of the equation.
$P - 2w=2\ell+2w - 2w$
$P - 2w = 2\ell$

Step2: Solve for $\ell$

Divide both sides of the equation by 2.
$\frac{P - 2w}{2}=\frac{2\ell}{2}$
$\ell=\frac{P - 2w}{2}$

Answer:

$\ell=\frac{P - 2w}{2}$