a From the example, we know that f(x+2) indicates to calculate the output for the input that is 2 greater than x. Similarly, f(c−4) must indicate to calculate the output for the input that is 4 less than c.
b The expression f(0.5b) indicates to calculate the output for the input that is half the value of b.
c The expression f(d)+12 indicates to add 12 to the output of d.
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