?/1 The graph shows the relationship between x, the amount of time in hours, and y, the distance traveled in miles, by a probe before it reaches Mars.

Does the graph represent a proportional relationship? Why or why not?
Justify your answer.

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

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 is the result of adding the system of equations? 2x+y=4 3x-y=6