Rez can run 18 miles in 4 hours. jamie can run 2/3 as many miles in 2 hours. who runs faster ?

What is the slope of the line shown below?

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks

Could somebody me with this radical simplification?