What is m to the power of 2 minus 11m minus 60 in product/sum method

Of four points are collinear, they are also coplanar

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?

Three times the sum of a number and seven is negative thirty-six. what is the number?