What's 3.548 rounded to the nearest 100

Every time you drive you will experience a combination of driving conditions and environments.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120