The answer to this is D i did the math i am positive it is right
As each chair needs 12.6667 feet lumber.So 15 chairs will need 15*12.6667=190.0005 lumber
Answer is D.
When you have an exponent that is a fraction, the denominator is the number you root the base by. In this case the exponent is 3/5, so you fifth root 13 cubed.
