help i dont understand this can someone help asap! please and thank you will give brainliest if i get the aswer right.​

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)

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?