A construction worker leans a 10-foot ladder against a wall. The base of the ladder is 6 feet away from the wall. How high up the wall does the top of the ladder reach?

✓ Correct Answer: Option B

This is a right-triangle problem using the Pythagorean theorem: a² + b² = c². Here, a=6 (base), c=10 (ladder length), and b is the height. So, 6² + b² = 10². 36 + b² = 100. b² = 64, so b = 8 feet.