When to use MC/I and when to use MC/It?

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In the Strength of Materials course, the confusion revolves around the use of the formulas Mc/I and Mc/It. The variable c represents the distance from the edge of the beam to the centroid, while t denotes the specific point of interest in the beam's cross-section. When analyzing maximum tension or compression stress, t equals c, simplifying the calculation. In other scenarios, t and c create a ratio that affects the stress calculation. Understanding these distinctions is crucial for accurately solving practice problems.
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I'm in a Strength of Materials course and I'm confused about when to use Mc/I and when to leave off the t, and what exactly the t and the c are. I thought that t was the distance to the centroid and that c was the distance to the line of action, but I'm running through practice problems and I think it's wrong.
 
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c is the distance from the edge to the centroid of the beam, yes. t is the particular point you want to look at in the cross section of the beam. In max tension or compression stress, t=c. Otherwise it becomes a ratio.
 

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