7. A company's yearly profit during its first 5 years of operation can be modeled by the equation P = 225(1.13)* + 400, where x is the number of years since the company started and P is the
profit in dollars. Draw a graph to represent this situation. If this pattern continues, what would
the company's profit be in year 7?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)