A scientist has 50 g of radioactive element. The amount of radioactive element after t days can be determined using the equation f (f) = 50 (1/2) ^t/5. After two days the scientist receives a second shipment of 50 grams of the same element. The equation used to represent the amount of shipment 2 remaining after t days is f (f) = 50 (1/2) ^t-2/5. Which of the following is an equivalent form of the expression for the amount remaining in shipment 2?
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