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Math Help - finding formula

  1. #1
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    finding formula

    The pressure P (in lbs per square foot), in a pipe varies over time. Four times an hour, the pressure oscillates from a low of 50 to a high of 260 and then back to a low of 50 . The pressure at time t=0 is 50 . Let the function f(t)=P denote the pressure in pipe at time t minutes.

    Find a possible formula for the function P=f(t) described above.

    period: ?
    amp: 105
    midline: y=155

    y=105cosx+155
    this is as far as i got i do not know what the period is
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  2. #2
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    Quote Originally Posted by midnightwynter View Post
    The pressure P (in lbs per square foot), in a pipe varies over time. Four times an hour, the pressure oscillates from a low of 50 to a high of 260 and then back to a low of 50 . The pressure at time t=0 is 50 . Let the function f(t)=P denote the pressure in pipe at time t minutes.

    Find a possible formula for the function P=f(t) described above.

    period: ?
    amp: 105
    midline: y=155

    y=105cosx+155
    this is as far as i got i do not know what the period is
    period, T = \frac{1}{4} hr

    B = \frac{2\pi}{T}
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  3. #3
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    105cos(8pi)x+155 correct?
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