Find means of the integers -3, -8, 12, -15, 9

How many zeros does the function f(x)=4x3-x2+1 have

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

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?