Downstream 280mi/7 hours
(Speed =change in position/change in time)
40mi/hr
Back
280/14
20mi/hr
True.
Since

,

and the solutions are decreasing functions.
Answer:
Step-by-step explanation:
first do 72times2,32times2,92times2, then add them all
The factors of 21 are 1, 3, 7, and 21