exam Maths Puzzle Numerical Ability

For the angle for two vectors in the 3rd and 4th quadrant. To get the correct answer do you have to add 360. As you would add 180 if the vector was in the 2nd and 3rd quadrant. Usi

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a bag contains 16 red checkers and 16 black cherkers. anne removes 1 black checher and 2 red checkers from the bag and does not replace them. she the reaches into the bag and selects a checker at random. what is the probability that the checker is red? Textbook Walls and Smith
The population of a country doubled in 100 years, what was the exponential growth rate?