Homework Help: math

Posted by toni on Friday, March 22, 2013 at 5:30pm.

an aquarium holding african cichlids is 2 inches higher than it is wide. Its length is 29 inches and its volumne is 3480 cubic inches. what is the height and width inches.

math - Reiny, Friday, March 22, 2013 at 5:39pm
length --- 29
width ---- x
height ----x+2

29x(x+2) = 3480
divide by 29 and expand
x^2 + 2x = 120
x^2 + 2x - 120 = 0
(x+12)(x-10) = 0
x = 10 or x is a negative, which can't be

the width is 10 inches
the height is 12 inches

check: 10(12)(29) = 3480

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