Please help me
The graphs below show four functions:
Graph A shows function f of x equals 5 multiplied by 2 to the power of negative x. Graph B shows function f of x equals 5 multiplied by 2 to the power of x. Graph C shows function f of x equals 10 to the power of x. Graph D shows function f of x equals 10 to the power of negative x.
Which graph best shows the function f(x) = 5(2)−x to represent the rate at which a radioactive substance decays?
Graph A
Graph B
Graph C
Graph D

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