What is the change in the scale factor from the old scale to the new scale?

Old: 1 inch = 3.3 feet. New: 1 inch = 1.1 feet.
1 to 3
1 to 2.2
2.2 to 1
3 to 1

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.