Write the equation of the line fully simplified slope-intercept form

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)

Solve the equation by completing the square. x^2+2x=17

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid