skatingby7522
09.12.2020 •
Mathematics
A bicyclist is riding at a speed of 18 mi/h when she starts down a long hill. The distance d she travels in feet can be modeled by d(t) = 41^2 + 18t, where t is the time in seconds. How long will it take her to reach the bottom of a 400-foot-long hill?
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Ответ:
8 seconds
Step-by-step explanation:
d(t)=400
4t^2+18t=400
4t^2+18t-400=0 subtract 400 from both sides
2t^2+9t-200=0 divide by 2 on both sides
x=8; -25/2 solve using quadratic formula
Ответ: