Guy please help me out so this is the question 3.  Last Sunday, the temperature at 8:00 a. m. was -3०C.  Between 8:00 a. m and 1:00 p. m., the temperature rose by 5०C.  By 6:00 p. m. the temperature was 2०C colder than it was at 1:00p. m.  Then, the temperature dropped 3०C each hour between 6:00 p. m. to 10:00 p. m.  What was the temperature at 10:00 p. m.? I got the answer -1 is that correct?​

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)