My office is 11 feet wide and 13 feet long with the ceiling being 8 feet above the floor. I would like to paint the walls light green. I will need to buy paint for square feet. Enter only a number as your answer.

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: