(1 point) The pressure P (in pounds per square foot), in a pipe varies over time. Two times an hour, the pressure oscillates from a low of 90 te a high of 280 and then back to a low of 90. The pressure at time t = 0 is 90. Let the function P = f(t) denote the pressure in pipe at time minutes. Find a possible formula for the function P = f(t) described above. f(1) = help (formulas)