exam Maths Puzzle Numerical Ability

what is the phase shift for 3sin(3x + Pi/2)

A) 3
B) -3Pi/2
C) -Pi/6
D) Pi/2

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exam Other Question

Preface: You are going to draw a random marble from a bag containing 5 red marbles, 8 green marbles and two blue marbles.

Question: What is the probability that you draw a red marble?
What are the odds that you draw a blue marble? Find the mode of each set of numbers

9, 8, 10, 9, 9, 10, 8