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

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm