The base of a rectangular fish tank measures 18 inches long by 10 inches wide. If it is filled with 1,080 cubic
inches of water, how many inches high would the water be in the fish tank?

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.