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Tracy has a cell phone plan that provides 250 free minutes each month for a flat rate of $29. For any minutes over 250, Tracy is charged $0.35 per minute. Which of the following piecewise functions represents charges based on Tracy's cell phone plan?

A. f(x)={29,x less than or equal to 250} {20+.35x,x>250}
B. f(x)={29,x>250} {20+.35x,xless than or equal to 250}
C. f(x)={29,xless than or equal to 250} {.35x,x>250}
D. f(x)={29,xless than or eual to 250} {29+.35(x-250),x>250}

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  2. 👎
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  4. ℹ️
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  1. Not A. It charges double for minutes over 250

    Not B. flat rate up till x=250

    Not C. Drops the $29 for x>250

    Clearly D. Only charges the .35 for those minutes over 250.

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    2. 👎
    3. ℹ️
    4. 🚩

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