Answer:
The correct option is 1.
Explanation:
It is given that Alton has been recording the number of apples on his apple tree each week, as shown below
Week Apples
2 15
3 22
4 29
5 36
The function representing alton's apples per week is
..... (1)
The slope intercept form of a line is
.... (2)
Where, m is slope and b is y-intercept.
From (1) and (2), we get

The slope of the function is 7 and y-intercept is 1.
It means the number the apples increased by 7 each week and the initial number of apples is 1.
Since 1 represent the number of apples at the start, therefore the correct option is 1.