Final answer:
When A2 changes from 5 to 8, the value in C3, which contains the formula '=A2*2', will change from 10 to 16.
Step-by-step explanation:
If A2 is changed from 5 to 8, the value that will appear in C3 if C3 contains the formula =A2*2 can be calculated by substituting the new value into the formula.
First, we replace A2 with 8.
Now we have =8*2.
Multiplying 8 by 2 gives us a value of 16.
Therefore, the value that will appear in C3 is 16.