a lake has 1.2 million gallons of water. Due to global warming and public use, the lakes volume decreases at a rate of 2.3%. To the nearest gallon, what will the volume of the lake be in 20 years?

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.