Suppose you have a 5x5 checkerboard with 25 squares. You put one penny on the first square, then 2 pennies on the next square then 2 pennies on the third square and so on until there are pennies on all the squares. How many pennies are on the 25th square?

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.