Final answer:
Peter's total estimated monthly expenses are $670 when rounding his electric bill, TV streaming service, and rent to the nearest tens before summing them.
Step-by-step explanation:
To estimate Peter's total monthly expenses by rounding to the nearest tens, we will round each individual expense and then sum them up. The electric bill is $34.80, which rounds to $30. The TV streaming service is $27.99, which also rounds to $30. Lastly, the rent is $614.85, which rounds to $610. Adding these rounded expenses, we get:
- Electric bill: $30
- TV streaming service: $30
- Rent: $610
Summing these amounts gives us Peter's total estimated monthly expenses of $670.