math

If r = square root 3V/pi*h , by what number must we multiply V in order to multiply r by 9 ?

a. 3
b. 9/2
c. 9
d. 18
e. 81

please answer and explain

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  1. r^2 = k V

    k = r^2/V

    if you multiply r by 9, then V by 81

    k = (9r)^2/81V = r^2/V

    so e

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