SOLUTION: Lyft is offering a deal of 0.09 cents per minute if you are driving to anywhere under or equal to 15 minutes. If the location is over 15 minutes, it doubles to 0.18 cents per minut

Algebra ->  Equations -> SOLUTION: Lyft is offering a deal of 0.09 cents per minute if you are driving to anywhere under or equal to 15 minutes. If the location is over 15 minutes, it doubles to 0.18 cents per minut      Log On


   

Question 1160469: Lyft is offering a deal of 0.09 cents per minute if you are driving to anywhere under or equal to 15 minutes. If the location is over 15 minutes, it doubles to 0.18 cents per minute. The domain of the function they have described (use interval notation if possible).
Found 2 solutions by CubeyThePenguin, ikleyn:
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) = 0.09x if 0 < x <= 15

0.18x if x > 15

Answer by ikleyn(52916) About Me  (Show Source):
You can put this solution on YOUR website!
.

The answer by @Penguin is INCORRECT.

The correct answer is THIS: 


        The domain of this function is the set of all real non-negative numbers.


// In this calculation, the real number of minutes first is converted to the closest integer number of minutes . . .


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Strictly saying, the problem's wording in INCORRECT.

Correct wording should say that 

    " . . . If the location is over 15 minutes, it doubles to 0.18 cents per minute for minutes that exceed 15 minutes".

Therefore, the way how @Penguin deciphers the cost function is INCORRECT, too.


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To @CubedThePenguin: 

    It is obvious that the given problem is created/composed unprofessionally.


    At this forum, there is a lot of such unprofessional problems creators.


    I don't know what is the best: ignore their posts or unmask them.


    But what is TOTALLY WRONG is to threat them as serious writers, when their formulations are absurdist . . .