A baker sells bread for $3 a loaf and rolls for $1 each. The baker needs to sell $21 worth of baked goods by the end of the day.
Enter a linear equation that describes the problem.

An equation for the value of the baked goods is ___=21, where b is the number of
loaves of bread sold, and r is the number of rolls sold.

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)