posted by Aniya on .
A 10-gal aquarium is 3 in. higher than it is wide. Its length is 21 in, and its volume is 2730 in^3. What are the height and width of the aquarium?
I am stuck.....I think I am doing it wrong. I have the answers but I don't know how to get there....Help!
Let x be the width. x = 3 is then the height.
21 x*(x+3) = 2730
x(x+3) = 130
x^2 +3x -130 = 0
(x-10)(x+13) = 0
The only meaningful root is x = 10.