Emma, Steve, Maria, and George are comparing the solution of a math assignment problem below.

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

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 t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.