The volume of a cylinder is r^2

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enter values, then you get 3.53, multiply that by the BTU, the answer is 8888 BTU
If there are 1.5 times as many pairs of walking shoes as there are running shoes on display, then it is best to take each amount of running shoes and multiply it by 1.5, if doing that equals the amount of walking shoes, then it would be correct. Which in this case, would be D.
95
^
19 times 5
^
1 times 19 times 1 times 5