anonymous
  • anonymous
The grade x of a hill is a measure of steepness and correlates to the slope of the freeway. the braking distance is D in ft for car traveling 60 miles per hr on a wet uphill grade is given by expression d(x) = 3600/ 30x+9 ...evaluate .12 = ? ft and find the grade for braking distance at 320 ft = ?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
evaluate .12 = ? ft <---- what does this mean? also substitute d(x) = 320 ft to find the grade in the second part.
anonymous
  • anonymous
you have to use.12ft and evaluate it to get ...answer ?
anonymous
  • anonymous
does that mean x = 0.12?

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anonymous
  • anonymous
yes
anonymous
  • anonymous
sorry it was hard to write it on here
anonymous
  • anonymous
then substitute x = 0.12 in your expression and solve for d(x)

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