The question is worded a bit strangely (in my opinion anyway), but I think your teacher wants you to describe how exponents work.
Let's say we had the expression 
The base is 5 as its the bottom most value (think of something like the base of a tree or building). The exponent is 3.
The exponent of 3 tells the reader to multiply the base 5 by itself 3 times like so

With larger exponents, it becomes more tedious to write out all the repeated multiplications, which is why many calculators have an exponent button to save time.
Answer:39%
Step-by-step explanation:
78/100÷2
78/100×1/2
=39
Answer:
.375
Step-by-step explanation:
plug it into calc.
Answer:
2 coins
Step-by-step explanation:
Answer:
answer b
Step-by-step explanation:
hope that helps