exam Maths Puzzle Numerical Ability

Please help me:

1. How many solutions exist for a quadratic equation? How do we detemine whether the solutions are real or complex?

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exam Other Question

Dave Bowers collects U.S. gold coins. He has a collection of 46 coins. Some are $10 coins and the rest are $20 coins. If the face value of the coin is $640, then how many of each denoination does he have? Use the six-step method. What is the name of the polygon whose interior angles have a sum of 540 degrees?

Thanks,
Amanda