High concentration of carbon monoxide CO can cause coma and possible death. The time for a person to reach a COHb level capable of causing a coma can be approximated by the quadratic model T=.002x^2 - .316x + 127.9, where T is the exposure time in hours necessary to reach this level and 500 ≤ x ≤ 800 is the amount of carbon monoxide present in the air in parts per million (ppm)
a) What is the exposure time when x= 800?
b) Estimate the concentration of co necessary to produce a coma in 9 hr
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