The one you have selected is correct
Answer: 20 problems
Step-by-step explanation:
There were 25 questions in this test.
The student got 80% out of these so the problems that the students got right were:
= 80% * 25
= 20 problems
For this case we have the following expression:
For power properties we have:
In the division, when we have the same base, the exponents are subtracted.
We then have to rewrite the expression:
Answer:
Completing the expression we have: