Explain how finding 4x384 can you find 4x5,384

Find an equation for the linear function which has slope -10 and x-intercept -7

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?

Find the area of the regular hexagon if a side is 20 cm.