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Question: Heat index During a recent summer, Dallas, Texas, endured 29 consecutive days on which the temperature was at least 110°F. On many of those days, the combination of heat and humidity made it feel even hotter than it was. When the temperature is 100°F, the apparent temperature A (or heat index) depends on the humidity h (expressed as a decimal) according to

A = 90.2 + 41.3h*

(a) For what humidity levels is the apparent temperature at least 110°F? (Note that this answer will be a closed interval. Why?)

(b) For what humidity levels is the apparent temperature less than 100°F?

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