book Maths Puzzle Numerical Ability

I cannot see to solve this one. Can someone help me out? Thanks!

Maya has deposited $600 in an account that pays 5.64% interest, compounded continuously. How long will it take for her money to double?

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book Other Question

Can you please help me? I am really confused.

Bobby and Rick are in a 10-lap race on a one-mile oval track. Bobby, averaging 90 mph has completed two laps just as Rick is gettin Write the equation of the line passing through (-3,-5) and (3,0).

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