Determining the time at which concentration begins to decrease

[ttpp1124]

Homework Statement

The question asks, "at what time.." does that mean at the fifth hour? Or after five hours and 24 minutes? I'm stuck with wording my answer

Relevant Equations

n/a

 

[Chestermiller]

Homework Statement:: The question asks, "at what time.." does that mean at the fifth hour? Or after five hours and 24 minutes? I'm stuck with wording my answer
Relevant Equations:: n/a

View attachment 262780

Your approach to determining the time when the concentration begins to decrease makes no sense to me. And the time for concentration to be equal to zero is at time t = 0 only. Please describe your rationale for determining the time when the concentration begins to decrease.

 

[Mark44]

"At what time does the concentration begins (sic) to decrease?"
A function is increasing if its derivative is positive; a function is decreasing if its derivative is negative.