Chapter 4 - An Introduction to Functions - 4-3 Patterns and Nonlinear Functions - Practice and Problem-Solving Exercises - Page 251: 25

The 29-oz can has the lower cost per ounce.

When you divide $0.89$ by $15$, you get approximately $0.059$ The 15-oz can costs approximately 0.059 cents per ounce. When you divide $1.69$ by $29$, you get approximately $0.058$ The 29-oz can costs approximately 0.058 cents per ounce. The 29-oz can costs less per-ounce than the 15-oz can.