What is the probability of picking a pink marble and flipping heads

There are 4 blue marbles

1 purple marble

1 pink marble

1 orange marble

write your answer as a fraction or a whole number with fractions users(/)to separate the numerator and denominator

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)