Answer:
14 slices
Step-by-step explanation:
First, for simplicity, find the total number of slices.
7*8=56 slices
Now, multiply that by 75%, or .75.
56*.75=42 slices
Finally, to find the ones not eaten, subtract 42 from 56.
56-42=14 slices
64
total of a triangle adds up to 180 degrees
so:
76+37=116
180-116=64