1. twelve could be purchased for $132. write the two rates (ratios) implied by this statement. how many could be purchased for $1716?

2.what decimal part of 450 is 90?

3.what fraction of 72 is 45

4.what decimal part of 255 is 153?

5. four tenths of what number is 632

6.two and one fifth of what number is 6 1/3?

7. what fraction of 3 1/5 is 6 1/5?

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)