Ascuba diver swimming at the deppe shown, and then swim 0.5 feet toward the surface every three seconds. what is the location of the scuba diver, relative to the surface, after 15 seconds?

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

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?

I'm confused on this could anyone me and show me what i need to do to solve it.