Substitutions
1.x + 4y = 6
y = -x + 3

2.x + 2y = 6
x - y = 3

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)

What is the perimeter of an equilateral triangle if each side is (x+3)?

Based on the spreadsheet below, which of the following is a true statement?