Asked by -Untamed-

y = 0.005x^2-0.801x+46.928

^ Using that model above, how di I determine the cost per km to the nearest tenth of a cent, at a speed of 70 km/h?

I think I use a graphing calculator for this, and since speed is the x value I probably have to insert in 70.
Answered by Reiny
yes, just sub in x=70 and evaluate

(I got 15.358 or 15.4 to the nearest tenth )
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