A customer buys an item that originally costs x dollars from a retail store and uses a $10.00 off coupon. The store clerk uses the function C(x)=1.06(x−10) to calculate the final cost of the customer’s item.

There would be 36.35 pounds

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.