A piggy bank contains 35 coins.
Each coin is either a quarter or a dime.
Altogether, the coins have a value of $4.90.

Complete the table and write a system of equations to represent the number of each type of coin.

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.