Which expression results in a sum or difference of 1 3/5

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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?

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.