Final answer:
The equation to represent the total number of pencils Scott bought is P = 15N, multiplying the number of packs (N) by 15.
Step-by-step explanation:
To find the total number of pencils that Scott bought, we should create an equation that represents the relationship between the number of packs and the total pencils. The correct equation is P = 15N, where P stands for the total number of pencils and N is the number of packs that Scott bought. Since each pack contains 15 pencils, you multiply the number of packs by 15 to get the total number of pencils.