Which numbers are necessary to solve this problem?
brian goes to the gym 3 times a week. he exercises for 45 minutes each visit. fifteen of those minutes are spent on weights and the rest are spent on the treadmill.
how much time does brian spend on the treadmill in 4 weeks?
a.
3 times a week, 45 minutes, 15 minutes, 4 weeks
b.
3 times a week, 15 minutes, 4 weeks
c.
3 times a week, 45 minutes, 4 weeks
d.
3 times a week, 15 minutes

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)