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.
yes, just sub in x=70 and evaluate
(I got 15.358 or 15.4 to the nearest tenth )
To determine the cost per km to the nearest tenth of a cent at a speed of 70 km/h, you can follow these steps using the given model equation:
1. Substitute the value of speed (x) into the equation. In this case, substitute x = 70.
y = 0.005(70)^2 - 0.801(70) + 46.928
2. Simplify the equation by performing the necessary calculations:
y = 0.005(4900) - 56.07 + 46.928
= 24.5 - 56.07 + 46.928
= 15.358
3. The result, 15.358, represents the cost per km. However, we need to round it to the nearest tenth of a cent.
Rounding 15.358 to the nearest tenth of a cent gives us 15.4 cents per km.