Here are the first 3 to show you how to do them
Answer:
2.38
Step-by-step explanation:
subtract 4.9 on both sides
Remember that the rule with multiplying exponents with the same base is to add the exponents together.
In this case: 
10^12 is your answer.
Answer:
3rd answer choice
Step-by-step explanation:

I guess it could represent a situation where you have

of a cake left and you have to share it with three of your friends (in addition to yourself). So that's four people sharing

of a cake.