The Ross family and the Morgan family each used their sprinklers last summer. The water output rate for the Ross family's sprinkler was 20 L per hour. The water output rate for the Morgan's family sprinkler was 40 L per hour. The families used their sprinklers for a combined total of 60 hours, resulting in a goal water output of 1700 L. How long was each sprinkler used?

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

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?

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!