exam Maths Puzzle Numerical Ability

6 square root 5y - square root 20y

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Please help!
Which of the following is NOT true about the hyperbola:
(y^2/25)-x^2=1
1. It has vertices at (0,+-5)
2. It opens to the right and the left
3. Its foci are at (0,+ 3. A group can charter an aircraft at a fixed total cost. If 36 ppl charter the aircraft rather than 40, then the cost per person is greater by $12. What is the cost per person if 40 people charter the aircraft?