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find how long it takes $1500 to double if it is invested at 7% interest compound semiannually. use the formula a=p (1+r/n)^nt to solve the compound interest problem.
it will take approximately how many years ?
round to the nearest tenth as needed.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)