book Maths Puzzle Numerical Ability

Hello again. I have one more question and then I'll try to figure out the rest of them on my own. Again, I'd appreciate any help.

Dave has $40,000 to invest. He invests part

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book Other Question

Find and simplify P(a+h)-P(a) given P(x)=x^2-2x What is the area of the sector of a 24 inch diameter circle where the distance "h" is 3 inches? "h" is the maximum distance from the outside of the circle to the chord.

Thank yo