week laps

1 18

2 28

3 38

4 48

A) the number of laps in week 0B) the week of the summer that she swam

C) the number of laps she swam in total D) the number of laps she increased her swim by each week

It looks like she increases by 10 laps every week; so the answer should be C, the number of laps she swam in total. (where the slope is the number of laps she swam per week).

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