The table below represents the total number of laps jessica swam in the pool this summer:
week laps
1 18
2 28
3 38
4 48

if the linear function representing the number of laps jessica swam each week is f(w) = 10w + 8, what does the 10 represent in this function?

the number of laps jessica swam in week 0
the week of the summer that jessica swam
the number of laps jessica swam in total
the number of laps jessica increased her swim by each week