Dayanara has a job where she earns $21 per week, plus $5 for every magazine subscription that she sells. She wants to use the money she earns to buy Knitting yarn This week, Dayanara wants to buy spring colored yarn. The total bill for all the yarn she wants cost $56.

Write and solve an equation to determine how many magazine subscriptions Dayanara needs to sell to make $56

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)