book Maths Puzzle Numerical Ability

Hello,

I need help :)

Here is the problem.

John wants to save for his daughter's college education. He figures he will need to have $30,000 for each of the four years of

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book Other Question
[(1+a/b)(1-a/b)]+(a/b-b/a) If angles A, B, and C are the sides of a triangle such that sin(A+B)=1/cosC and cos(A+B)=cosC, then show that the triangle is a right triangle.