The number of bacteria (b) in a batch of refrigerated food is given by the function b(t)=20t^2 -70t+300 where t is the temperature of the food in degrees Fahrenheit the function t(h)=2h+3 gives the temperature of the food h hours after it is removed from refrigerated which expression correctly represents the number of bacteria (b) in the food as a function of the number of hours (h) the food is unrefrigerated
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