Please solve this by solving systems by elimination

6x+3y=-18

7x+7y=0

Explain why the factor 1.5 is broke. into two numbers in the model.

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)

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if