The half life of a certain substance is about 4 hours. The graph shows the decay of a 50 gram sample of the substance that is measured every hour for 9 hours. Which equation can be used to determine the approximate number of grams of the sample remaining after t hours?

A. y = 50(1/2)^t/4
B. y = 50(1/2)^t/9
C. y = 25(1/2)^t/4
D. y = 25(1/2)^t/9

Please explain!

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