If you are calculating a 15% off discount you need to to know the sale price

You have to multiply to know the sales price

The answers 5 so there’s the you need trust me it’s right

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.