Jason can mow his parents' yard in 3 hr. His brother can mow it in 4 hr. How long would it take them, working together, to mow
the yard? (Assume two mowers are available.)

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)

Find the percent error of the measurement 4 cm

What is the benefit of converting measures in a ratio to the same unit