Identify the dependent variable in the following situation: Lydia was 21 inches long at birth, and at the age of 3 is 36 inches.

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?

Which expression is rational? 6. , square root two, square root 14, square root 49

If value of cos330° is √3/2 then find tan165°.