Michael's bank account opened with $100. 5 weeks after opening, his account balance was $250. At this rate, how much money will he have 10 weeks after opening the account?

I am pretty sure it is $400. sorry if i’m wrong

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.