If W(-10,4) X(-3,1) and Y(-5,11) classify WXY by its sides

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

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?

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.