Answer:
the average is 168
Step-by-step explanation:
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The quadratic formula is
.
From the problem, a is 1, b is -1, and c is 12. Plugging in these values gives:

Because there is a square root of a negative number, there is no solution.
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Answer:
r=-6
Step-by-step explanation:
6r-7r=13-7
-r=6
r=-6