PLS HELP. I WILL MARK BRAINLIEST!!

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55