A diver descends to a depth of –25.6 feet relative to sea level. How many feet must the diver ascend to reach sea level? 0.6 feet 25 feet 25.6 feet 256 feet

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.