Answer:
Step-by-step explanation:
band alone 11
choir alone 17
band and choir alone 4
band and math alone 7
math and choir alone 6
band choir and math 3
math alone 9 from 11+4+10+6+17 + M = 57
so
2 classes = 4+7+6 = 17
17 students take exactly two classes with Mr. Green
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-72=-72
5n-42=12n
n=-6
5*(-6)-42 = 12*(-6)
-30-42=-72
So, n= -6 is the right number for this equation