What are the solution(s) to the quadratic equation 40 – x2 = 0? O x= +2/10
O x = +4/10
O x = +2/5
O x = +4,5

Help please it’s timed :)

What is the value of r of the geometric series?

Answer question above and explain each step : )

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?