Asked by wouiqhuid
Starting from 100 ft away, your friend skates toward you and then passes you. She skates at a constant speed of 20 ft/s. Her distance d from you in feet after t seconds is given by d=|100-20t|. At what times is she 80 ft from you?
Answers
Answered by
oobleck
|100-20t| = 80
100-20t = ±80
20t = 100±80
t = 5±4
t = 1 or 9
100-20t = ±80
20t = 100±80
t = 5±4
t = 1 or 9