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Q7.
Here is some information about household rubbish in 2006.
About 6.8 million tonnes of household rubbish is recycled
This is 27% of total household rubbish
About 20.1 million tonnes of household rubbish could be recycled,
What percentage of household rubbish could be recycled?

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)