Rate of Change of NO Concentration

Question

Using the graph of NO concentration given by $$N(t)= 0.2*t^2 - 2*t + 40$$, determine the instantaneous rate of change at t = 5 hours.

Accepted Answer

0 ppm per hour.

Answer

-1 ppm per hour, which results from miscalculating the derivative.

Answer

0.5 ppm per hour, due to an error in differentiating the quadratic term.

Answer

2 ppm per hour, obtained by mistakenly substituting into the original function.