Experts say that 25% of all serious bike accidents involve head injuries and that of all head injuries, 80% are fatal. What percent of of all serious bicycle accidents involve fatal head injuries?

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)

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Solve the equation.then check your solution 8=1.88+a