Final answer:
The probability that Mrs. Schultzkie corrects Algebra papers first is 1/3.
Step-by-step explanation:
To find the probability that Mrs. Schultzkie corrects Algebra papers first, we need to consider the total number of possible outcomes and the number of favorable outcomes for this event.
Since there are three classes, the total number of possible outcomes is 3 (Algebra, Geometry, Trig).
Now, since Mrs. Schultzkie corrects the papers at random, each class has an equal chance of being corrected first. Therefore, the number of favorable outcomes for the event of correcting Algebra papers first is 1.
So, the probability of correcting Algebra papers first is 1 out of 3, or 1/3.