Answer:
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Step-by-step explanation:
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1/10
16 runners
you have to add up all the runners that are under 13 minutes. Which is, 8+6+2 = 19 runners
28n^4 +16n^3 -80n^2
we can factor out a 4n^2
4n^2 (7n^2 +4n - 20)
4n^2 (7n-10) (n+2)