Expression 1: "B" left parenthesis, "t" , right parenthesis equals StartFraction, left parenthesis, 10 times 600 , right parenthesis Over 10 plus left parenthesis, 600 minus 10 , right parenthesis times "e" Superscript, negative 600 times 0.0 0 7 4 4 7 3 "t" , Baseline , EndFractionBt=10·60010+600−10·e−600·0.0074473t