Answer:
Hailey walked 70 miles last month.
Explanation:
Consider the provided information.
Hailey walks at an average rate of 3.5 miles per hour.
She walked 3 weeks at her regular rate for 6 hours per week.
![3* (6* 3.5)=3* 21=63](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vrhcrloycl691ibwe7gsyx9ki71yo2kyt6.png)
Hence, she walk 63 miles in last 3 weeks.
She walked 1 week at one-half her regular rate for 4 hours.
Half of her regular rate is
![3.5/2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gz42jvgmhr1n3mud0w7lfqst56tceqbfkk.png)
Therefore, the distance covers
![1* (3.5/2)4=7](https://img.qammunity.org/2020/formulas/mathematics/middle-school/crr8f6q9ltykiysg2d76re8gr7qa9dqw9o.png)
The sum of distance is: 63+7=70
Hailey walked 70 miles last month.