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Activity 1:
Wildflowers
Examiner use only
1 (a)
Tess does voluntary work for a local nature group.
The group wants to estimate the number of wildflower plants in a field.
To calculate the area of the field, Tess has to work out 40
Calculate the value of 40sq
[2 marks]

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)