Select all of the expressions that are equivalent to 6+12x

Acylinder has volume 45π and radius 3. what is it’s height?

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?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle