Question 567693
The total cost,c, in dollars, renting a car is given by c= 28d+.35, where d is the number of days and k is the number of kilometres driven...
  Solve for k.
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Cost probably includes 0.35 per kilometer.
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You equation is probably:
c = 28d + 0.35k
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solve for "k":
0.35k = c-28d
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k = (c-28d)/0.35
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Cheers,
Stan H.