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The function h is defined by h(x)=(20x−k)÷x+50, where k is a constant. Find k, if the value of ℎ at x=20 is equal to 65.


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Answer :

Pipernay
65=(20•20 - k) / 20 +50
15=(400-k)/20
300=400-k
-100=-k
100=k

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