I posted the same one but trolls exist and they took up the two answers with nonsense, so PLEASE. If you dont have an answer, don't say anything

X2 + y 2 = 36 x + y = 6 solve the system of equations.

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)

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?