Answer
$652.5~bacterias$
Work Step by Step
$(N~o~T)(t)=90t^2+60t+600~~$
$(N~o~T)(0.5)=90(0.5)^2+60(0.5)+600~~$
$(N~o~T)(0.5)=90(0.25)+30+600~~$
$(N~o~T)(0.5)=652.5$
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