Christian had $80.45 in his bank account on Monday. He deposited $20.50 on Tuesday. He then withdrew 37.25 on Wednesday. How much did Christian have left in his account on Thursday?

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.