Isa makes a goal to drink 56 cups of water this week. She drinks 9 cups of water on each of the first 4 days of the week. How much water does Isa need to drink the rest of the week to meet her goal? 20 cups 24 cups 36 cups 43 cups 2 3 4 5 6 7 8 9​

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.