Bonnie has a container in the shape of a pyramid. The formula for the surface area of enclosed space is a=lw+0.5ph. Solve for p.

S = lw + 0.5Ph

You take 0.5Ph to left side:

- 0.5Ph = lw - S

Then you divide both sides by - 1:

0.5Ph = - lw + S

Then divide both sides by 0.5h:

P = - lw + S/0.5*h

Then rearange the equation:

P = S - lw / 0.5*h

From this,

P = The quantity S minus l times w all divided by 0.5 times h