Describe how you can use a formula to solve the following problem: The inner edges of a cube-shaped pot have a length of 1.5 feet. How much does it cost to fill the planter if soil costs $4 per cubic foot?
Creating a formula:
Let a be the length of each edge of the pot (area of a cube = a3)
Let c be cost per cubic foot
Cost to fill = a3 * c
1.53 = 3.375 cubic feet
1.53 * 4 = $13.50 to fill the planter