You are creating a model of a bookcase for a dollhouse. The actual bookcase is 48 inches tall and 32 inches wide.
If you plan to make the model 3 inches tall, how wide do
you have to make the model if you want the rectangular
shapes of the bookcases to be similar figures?

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)