Strontinum-90 has a half life of 29.1 years.The amount S of 100 kilograms of Strontinum6990 present after t years is given by $S = 100 e ^ { - 0.0238 t }$ How much of the 100 kilograms will remain after 50 years?
A)about 31.4 kilograms
B)about 35.4 kilograms
C)about 30.4 kilograms
D)about 37.4 kilograms
E)about 40.4 kilograms

Question

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The Answer of Strontinum-90 has a half life of 29.1 years.The amount S of 100 kilograms of Strontinum6990 present after t years is given by $S = 100 e ^ { - 0.0238 t }$ How much of the 100 kilograms will remain after 50 years?
A)about 31.4 kilograms
B)about 35.4 kilograms
C)about 30.4 kilograms
D)about 37.4 kilograms
E)about 40.4 kilograms

Strontinum-90 Has a Half Life of 29 S=100e−0.0238tS = 100 e ^ { - 0.0238 t }S=100e−0.0238t

Strontinum-90 Has a Half Life of 29 $S = 100 e ^ { - 0.0238 t }$