What is 7.9⋅10^7 +6.5⋅10^6 in scientific notation.

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?

Are the corresponding angles congruent? explain why or why not.

What ia the sum if the first 7 terms of the geometric series