Which statement is best represented by the inequality d less-than 0.35? The pen costs less than $0.35. The pencil costs greater
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You could determine the quadratic approximation of the curve near which gives you a good estimate since the function is relatively monotone.
First calculate the second derivative,
Then write down the quadratic approximation,
That yields,
Of course this can be further simplified but its not obligatory.
Hope this helps.