A bakery sells single layer mini-cakes that are 3 inches in diameter for $4 each. They also have a 9-inch cake for $15. If both cakes are the same thickness, which option gives you more cake for the money, nine mini-cakes or one 9-inch cake?
Both cakes having the same thickness means both radius are the same.
-Solve for radius using diameter equation
-Use radius to find Circumference of each size cake
-Able to determine which cake size (mini-cakes, or bigger one) has larger circumference =the cake that gives you more value for the money
1. Diameter= (2)(radius)
2. Circumference= (pi)(diameter)
3. 9.42 inches per 1 mini-cake
4. $4/cake(9 cakes)= $36
Option 1: You would get 84.78 inches of cake if you purchased 9 mini-cakes at $36
1. r=3/2 inches
Option2: You would get 28.26 inches of cake if purchased 1 9-inch cake at $15