Julia writes 2 fractions with the same denominator that have numerators 5 and 7 what could the denominator be if the sum is less than 1

5+7=11 so any denominator above 12

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.