medium · SAT Math

A city library tracks the cumulative number of books donated to its used-book sale, recorded at the start of each week. Week (x) Cumulative books donated (y) 0 12 1 19 2 26 3 33 The pattern in y could be linear (a constant first difference between consecutive values) or exponential (a constant ratio between consecutive values). Determine which model fits the data, then predict the cumulative number of books donated at week 4.

1. 33
2. 39
3. 40
4. 42

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