The double number line below shows the approximate number of pounds in a certain number Kilogramss 5 Pounds Based on the number line, about how many pounds are there in 4.5 klograms? 1. 8

2. 9

3. 10

4. 11

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)