B Model 6 (3), Start with 6 positive counters to represent 6
You need to take away 3 negative counters,
so add 3 zero pairs.
Take away 3 negative counters to represent
subtracting 3.
What is left
Find the difference: 6 (3)

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)