Question: Set up the necessary equation where appropriate and solve the given problems. All numbers are accurate to at least two significant digits.
A testing station found P parts per million (ppm) of sulfur dioxide in the air as a function of the hour h of the day to be p = 0.00174(10 + 24h - h2). Sketch the graph of P = f(h) and, from the graph, find the time when p = 0.205 ppm.