15. jackson builds legos at a rate of 3 projects per hour. write
a function that represents the relationship between the amount of
legos built, b, and the number of hours he works, h.

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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)

Which method of gathering data will be most effective in learning how diet and fitness choices affect long-term healt