6. austin began a repiping job with 26 yards, 2 feet, 5 inches of pipe. when he finished the job, he had 13 yards, 2 feet, 7 inches. how much pipe did he use for the repiping job? convert the answer to larger units whenever possible. a. 13 yards, 2 inches b. 13 yards, 4 feet, 2 inches c. 39 yards, 4 feet, 12 inches d. 12 yards, 2 feet, 10 inches

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)