9(-3y - 5) -3y + 45 27y - 45 -27 + 45 27y + 45

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

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?