The metabolic rate of an ectothermic organism increases with increasing temperature within a certain range. Experimental data for the oxygen consumption C (in microliters per gram per hour) of a beetle at certain temperatures can be approximated by the model C = 0.45x2 − 1.65x + 50.75,    10 ≤ x ≤ 25 where x is the air temperature in degrees Celsius. (a) The oxygen consumption is 165 microliters per gram per hour. What is the air temperature (in °C)? (Round your answer to one decimal place.)  °C (b) When the air temperature increases from 10°C to 23°C, by approximately what factor does the oxygen consumption increase? (Round your answer to one decimal place.)

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