The objective function represents the quantity that you want to maximize or minimize in an optimization problem. In this case, Susan wants to maximize the money raised at the bake sale.
The amount of money raised can be calculated by multiplying the number of pumpkin bread loaves (x) by the selling price of each pumpkin bread loaf ($5), and adding it to the product of the number of zucchini bread loaves (y) and the selling price of each zucchini bread loaf ($4).
Therefore, the objective function for this problem is:
P = 5x + 4y
So, the correct option is:
P = 5x + 4y