anonymous
  • anonymous
can anyone help me with this question? the function d(s)=0.0056s^2 +0.14s models the stopping distance of a car, d(s), in metres, and the speed, s, in kilometres per hour. What is the speed when the stopping distance is 7m? Use a graph to solve.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
plug your information into the equation (hard to graph stuff on here): 7 = .0056s^2 +.14s 0 = .0056s^2 + .14s -7 either factor or use the quadratic formula to solve.
anonymous
  • anonymous
thanks, but i dont know what to factor out in the second equation, thats where i got stuck
amistre64
  • amistre64
thinking.....(12% loaded).....

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amistre64
  • amistre64
if I did it right, and thats a BIG if... s = 28 better plug it in to double check...
anonymous
  • anonymous
alright, checking
amistre64
  • amistre64
ack!! not correct....
anonymous
  • anonymous
how did u get it? im so lost :p
amistre64
  • amistre64
lol .... I just plugged it into the quadratic formula but made a mistake somewhere... gonna try it again :)
anonymous
  • anonymous
sounds good : )
amistre64
  • amistre64
lets try 25 :)
amistre64
  • amistre64
25 works good :)
anonymous
  • anonymous
alright, thank you (:

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