Answer:
$
or ≈$
![563.00](https://img.qammunity.org/2021/formulas/mathematics/high-school/hs9h55iq6zdoe8hrzr4kaplyf48gkhidj0.png)
Explanation
The question states that Mrs. Hadley spent $126.97 on one month, $237.81 on the next, and $198.42 on the last. To get the total, we can add these values together.
![126.97+237.81+198.42=563.20](https://img.qammunity.org/2021/formulas/mathematics/high-school/oxnkpty3wii5eofsp9wlavbgke1tbupt4d.png)
An estimation would be:
![127+238+198=563](https://img.qammunity.org/2021/formulas/mathematics/high-school/agxmovrgqwbxv18mc5jejhiqzmctlt3cia.png)
We can use this estimation to determine that the total value is reasonable.