10 is the estimate because you have 58, and you put it in 589 10 times.
Answer:
First answer: "Add the exponents"
Step-by-step explanation:
The laws of exponents include the following for product of exponents with the same base:

which implies addition of exponents
So you need to add exponents
For #3, it's 5.4 because you divide the total amount of money made by the amount of money earned per hour.
49.95/9.25=5.4 hours