Kelly flies a distance of 2,100 miles. The trip takes 4 hours. A. What is the airplane's unit rate of speed in miles per hour?
B. At this rate of speed, how many miles will the airplane travel in 13 hours?

2men and 7 boys can do a piece of working 4 days.it is done by 4 men and 4 boys in 3 days how long would it take for 1man or one boy to do it alone

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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)