10. MP PROBLEM SOLVING You notice that
temperatures in Canada are reported in degrees
Celsius. You know there is a linear relationship
between degrees Fahrenheit and degrees Celsius,
but you forget the formula. From science class, you
remember the freezing point of water is 0°C or 32°F,
and its boiling point is 100°C or 212°F.

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)