The volume of a pyramid is given by the formula  v  =  bh3,  where  b  is the area of its base and  h  is its height. the volume of a pyramid is  84  cubic centimeters. its height is  9  centimeters, and one side of its rectangular base is 3 centimeters shorter than the other. find the dimensions of its base.

First I would start plugging the values into the volume equation for a pyramid. 

then I would multiply both sides of the equation by 3 to get rid of the dividing 

then I divide both dies by 9 to solve for B

Then I would just find combination s of numbers that when multiplied equal 28, I would just find all of the pairs then rule out the ones that dont have a difference of 3, the one(s) left should be your base dimensions. 

I did this and got 4 and 7