book Maths Puzzle Numerical Ability

A woman deposits $50,000 in a savings account with 4% continuously compounded interest. How many years must she wait until the balance has doubled?

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book Other Question
What is the inverse of the equation f(x) = -2x + 5? I need to find the slope-intercept form of (0,1) (3,-8). How do i figure out how to find the equation?