The width of the prism is 1 ft more then the height. Also the lenght of the prism is 3 feet more then the height
Let h = height
Then, width = h+1 and length = h+3
volume = h(h+1)(h+3) = 69
h(h^2+4h+3) = 69
h^3+4h^2+3h-69 = 0
using root calculating program:
h = 2.944 ft
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