Can anybody help me on my math final exam for 7th

like as a tutor

edge nuity

What is the inverse of the function f(x) = 2x + 1?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.