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Suppose a metal block is cooling so that its temperature t (in degreesc) is given by upper t equals 200 times 4 superscript negative 0.2 t baseline plus 30, where t is in hours.
a. find the temperature after (i) 3 hours, (ii) 4.5 hours. b. how long has the cooling been taking place if the block now has a temperature of 130degreesc? c. find the eventual temperature (tright arrowinfinity).
Sagot :
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