It all depends on the amount of numbers before it.
But these decimals are 3 significant figures
Pardon but which question do you need help in?
Explain what? i don't see what your question is...
It will take Alexis 5 weeks. If she starts off with $50, she will still need $150. Then, she earns $30 each week every week. Making $30 for 5 weeks will get Alexis to $150, because 30×5 is 150. Then once you add in the money she started with you will get $200. $150+$50=$200.