What is the slope of -3,4 and 5,8

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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?

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points