Which of the following functions decreases, going downwards from left to right?

For an exponential function of the form y = a·b^x, the function decreases when a is positive and the base b is between 0 and 1. Choice B has a positive coefficient, 2, and base 0.3, so its values decrease as x increases. Choice C has a negative coefficient, which reverses that behavior and makes the function increase.

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