On a drawing of a model airplane the scale used is 1 in :3 ft how many feel would 4:5 inches represent

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

58 i think in 5 hours he makes $58