book Maths Puzzle Numerical Ability

How are whispering galleries related to conic sections, and could I have an example of a formula that would be used to show a whispering gallery?

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book Other Question

Iam not sure if Iam coming up with the right answer to this problem

Here it is...

Solve
3x^2 - 13x - 10 = 0

Iam coming up with x=-2/3 and x = 5

Thank You for any help you can provide. While vacationing in the orient, Sonia spends $200 purchasing ornate chess sets for her figt shop in California. A week later she finds the same chess set selling for $5 less per p