What is the range of f of x is equal to 3 fourths to the x th power minus 4 ?

For every real x, (3/4)^x is positive, so its values are always greater than 0. Subtracting 4 shifts all those values down by 4, making f(x) always greater than −4 but never equal to −4. The range is therefore the set of y-values greater than −4, choice B.

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