Question

A student was asked to use the formula for the perimeter of a rectangle, P = 2ℓ + 2w, to solve for ℓ. The student came up with an answer, P − 2w = 2ℓ. What error did the student make? Complete the explanation. Then solve for ℓ.

The student only rearranged the formula so? but
did not ?

The formula for ℓ is ℓ = .

Answer 1

ρ = (P-2w)/2

Explanation:

The student did not complete the equation to solve for ρ.

ρ = (P - 2w)/2