Final answer:
Sandra has 250 miles left to cover after driving 425 miles. She wants to drive half of the remaining distance before stopping, which equals 125 miles.
Step-by-step explanation:
The question involves a distance calculation for Sandra's drive from Houston to Birmingham. Sandra needs to drive half of the remaining distance before stopping for the night. First, we need to calculate the remaining distance:
Distance between Houston and Birmingham: 675 miles
Distance driven so far: 425 miles
Remaining distance: 675 miles - 425 miles = 250 miles
Now, we calculate half of the remaining distance:
Half of the remaining distance: 250 miles / 2 = 125 miles
Therefore, Sandra needs to drive an additional 125 miles before stopping for the night.