If the point of the assignment is to get the most amount of cheese per dollar the answer is a.
You just divide the price with the number of ounces you buy and that will give you the price per ounce.
a = 5/(4*5) = $0.25 per ounce
b = 3.24/12 = $0.27 per ounce
c = 4.19/16 = 0.261875
therefore a is the best bang for the buck
Hope this helps :)
The red marble is farthest from the target.
13: 72.25
14: 52
For 14, you need to split the figure into a triangle and rectangle.