There are two steps used in writing an improper fraction as a mixed number. which step is done first?
a. multiply the numerator by the denominator.
b. write the fractional part of the mixed number by writing the remainder over the divisor.
c. multiply the whole number times the denominator.
d. divide the numerator by the denominator.

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)