Rectangle A measures 9 inches by 3 inches. Rectangle B is a scaled copy of Rectangle A. Select all of the measurement pairs that could be the dimensions of Rectangle B. OPTIONS:
A: 13.5 inches by 4.5 inches
B: 90 inches by 30 inches
C: 4.5 inches by 1.5 inches
D: 8 inches by 2 inches
E: 10 inches by 4 inches

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.