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Showing 311–312 of 312 questions
If x² - 5x + 6 = 0, what are the roots?
Correct Answer:
A. 2, 3
EXPLANATION
x² - 5x + 6 = (x-2)(x-3) = 0. Therefore, x = 2 or x = 3
If a train travels at 60 km/h for 2 hours and then at 40 km/h for 3 hours, what is the average speed?
Correct Answer:
A. 48 km/h
EXPLANATION
Total distance = (60×2) + (40×3) = 120 + 120 = 240 km. Total time = 5 hours. Average speed = 240/5 = 48 km/h