exam Maths Puzzle Numerical Ability

You are dealt two cards successively ( without replacement)from a shuffled deck of 52 playing cards. Find the probability that the first card is a king and the second card is a queen.

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How can I find the constan in this problem thank you for your help

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If y varies directly with x, and y = 54 when x = 3, find the constant of variation k Convert the following demand functions (compressed) to demand curves:

1. Q = 120-5P

2. Q = 1500-0.5P

3. Q = 20-200P

4. Q = 25-10P

Convert the following demand curves