What is the value of this expression when a= -3 and b=5? a + b^2*

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)

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20