Does anyone know how to do the first 3 for 1& 2 ?

The table respent two linear functions the equation respented by the first tables is given

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?

What does the sign of the slope tell you about a line?