21. PRODUCTION ABC Sporting Goods Company produces baseball gloves. Their fixed monthly
production cost is $16,000 with a per glove cost
of $15. XYZ Sporting Goods Company also
produces baseball gloves. Their fixed monthly
production cost is $20,000 with a per glove cost
of $13. Find the number of gloves produced
monthly, so that the total monthly production cost
is the same for both companies. (Lesson 2-4)

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)