The correct expression is 5 × (2 + 2), which corresponds to option B.
The student is asking how to estimate the number of miles Mary rode on her bicycle to school and back over a period of five days. Mary lives 1 ¾ miles away from school.
To estimate, we can round her one-way distance to the nearest whole number, which is 2 miles. Since she travels to school and back in a day, that's a total of 4 miles per day.
Over 5 days, she will travel 5 times that daily round-trip distance.
The correct expression for estimating the total number of miles Mary rode is: 5 × (2 + 2).
This is because we estimate her one-way trip as 2 miles, the round trip as 2 miles + 2 miles, and multiply by 5 days.
The correct answer from the provided options is B. 5 × (2 + 2).
Complete question:
Mary lives 1 ¾ miles from school. She rode her bicycle to school and back each day for 5 days.
Which expression shows how to estimate the number of miles she rode?
A. (5 + 2) × 2
B. 5 × (2 + 2)
C. (7 + 2) × 2
D. 7 × (2 + 2)