exam Maths Puzzle Numerical Ability

In a round-robin tennis tournament, every player meets every other player exactly once. How many players can participate in a tournament of 45 matches?

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exam Other Question

Use intercepts to graph each equation

2x+4=4
3x-6=y

Please help me on this I dont understand it.
Thanks
A mayoral election race is tightly contested. In a random sample of 1,100 likely voters, 572 said that they were planning to vote for the current mayor.

Based on this sample, w