Simplify 7y−4(9/4y−6)
(Thank you everyone for all your hard work)

Ithink it’s b because it say 3 plastic rings and all the balls

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.