Tom measured the length of the patio by counting the number of bricks that ran along the patio. he counted 60 bricks. each brick was ft long. what was the length of the patio?
a. 20 ft
b. 30 ft
c. 60 ft
d. 120 ft

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)