The upper left and bottom right are functions.
Remember a function has to pass the vertical line test. Elements from the domain cannot repeat, but elements from the range can.
9% of $2500 = 225
7 × 225 + 2500 = $4075
80 x 90/100 = 72
Therefore there were 72 milkshakes with whipped cream that were sold.
I believe that there are 23 different ways to get a total of 20. Then we need to find the number of ways to get each of the 23 different ways. For instance, one way is 6 6 1-1-1-1- 1-1-1-1: 101 / (21-8) = 45 (different ways to get this result) 10 different dice are rolled, giving the 101 in the numerator since the 6 is used twice, divide by 21, since the 1 is used 8 times, divide by 8! Etc., etc., etc. Final answers, add all these results together. I'm not sure about part B! I'm sorry!!!
