You begin with $30 in a savings account and $60 in your checking account. Each week you deposit $10 into your savings and $20 in your checking. After how many weeks is the amount in checking twice the amount in the savings?

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.