Question

1.Isabel exercises no less than 45 minutes per day.

Use t to represent Isabel's amount of exercise (in minutes per day).

2. The vehicle's fuel is at least 45 miles per gallon.
Use f to represent the vehicle's fuel efficiency (in miles per gallon).

Answer 1

[1] t ≥ 45

Since Isabel exercises more ("no less") than 45 minutes a day, we will use greater than or equal to.

-> because being equal is not less, hence still "no less"

[2] f ≥ 45

Because the vehicle's fuel is "at least" that means it can also be equal too, hence the user of greater than or equal to.