first I would start plugging the values into the volume equation for a pyramid.
[tex] 84 =\frac{B (9)}{3} [/tex]
then I would multiply both sides of the equation by 3 to get rid of the dividing
[tex]B(9) = 252[/tex]
then I divide both dies by 9 to solve for B
[tex] \frac{B(9)}{9} = \frac{252}{9} \\
B = 28[/tex]
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
