need help with missing dimension

[qtpie1096]

a = lw when a = 64 cm2
l = 16cm.

I just need some explanation... i am having a hard time understanding this.

[Denis]

a = lw when a = 64 cm2
l = 16cm.
I just need some explanation... i am having a hard time understanding this.

l times w = 64
16 times w = 64
So what does w equal?

[Mrspi]

a = lw when a = 64 cm2
l = 16cm.

I just need some explanation... i am having a hard time understanding this.

A = L*w

You know that A = 64 cm²
You know that L = 16 cm

Substitute into your formula:

A = L*w
64 cm² = 16 cm * w

Divide both sides of the equation by 16 cm:

64 cm² / 16 cm = w

Simplify the left side.