Plzzz answer parts a b and c for brilliant answer

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

What expression is equivalent to 1/2(2+3x-6)

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.