Answer:
miles did Isla walk that day.
Explanation:
As per the statement:
Isla walked 3/4 miles each way to and from the school Wednesday.
She walked each day = 3/4 miles.
We have to find how many miles did Isla walk that day.
Total miles she walked that day = Distance she walked to the school + Distance she walked from the school.
⇒
Simplify:

Therefore,
miles did Isla walk that day.