exam Maths Puzzle Numerical Ability

find the reference angle for the following angle:
-386degrees

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exam Other Question

If a = -3 and b = 4, evaluate 3a - 4b. Because of traffic Maria could average only 40 km/h for the first 20% of her trip, but she averaged 75 km/h for the whole trip. What was her average speed for the last 80% of her trip?