at t=0, d=200
That is the starting distance
you know what the 18 is.
Find t when 200-18t = 120
Your friend rides his bike toward you and then passes by you at a constant speed. His distance d (in feet) from you t seconds after he started riding his bike is given by d= 200 - 18t. What does the 200 in the equation represent? What does the 18 in the equation represent? At what time(s) is he 120 ft from you?
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