If the ratio of students packing a lunch to those buying lunch is 2: 9, then the number of students buying lunch is times the number of students packing a lunch. pls and i u any time u need streetfighterjaylow promise

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

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?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'