The cost for a 4-mile ride is $3.10, while a 7-mile ride costs $4.15. (1) Find a linear equation that fits the given information. Let C = the cost of the taxi ride. Let D = the miles covered by the taxi ride. Write your equation in 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 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)