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Mathematics 6 Online
OpenStudy (anonymous):

The pressure P (in pounds per square foot), in a pipe varies over time. Three times an hour, the pressure oscillates from a low of 120 to a high of 230 and then back to a low of 120. The pressure at time t=0 is 120. Let the function P=f(t) denote the pressure in pipe at time t minutes. Find a possible formula for the function P=f(t) described above.

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