Please help me answer these ASAP ‼️ will mark Brainliest ‼️ EXTRA POINTS‼️ The GCF of 24 and 36 is?

The GCF of 11 and 84 is?

The GCF of -64x and 56x is?

Please give me the answer for the each question :)

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)