C plus is between 3 and 3.2.
C = 75%
0% < Plus < 5%
75%+0% < C Plus < 75%+5%
75 < C Plus < 80%
75%*4 < C Plus < 80% * 4
(3/4)*4 < C Plus < (4/5) * 4
3 < C Plus < 16/5
3 < C Plus < 3.2
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Because there is no way to define the divisors, the equations cannot be evaluated.
A discriminant that is less than zero.
a=24 b=16 c=18
a = 20 b = 60 c = 100
z remains undefined.