The value of v is double gthe value of q- choose the correct formula

Can someone me with this problem . show your work .

Compare the cost of the bike trips from the two companies shown. for both the cost in a linear function of the number of days which statements is true

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)