Question 22 - High School Algebra I Practice Test for the STAAR test

An exponential function is graphed on the attached grid. Which function is best represented by the graph?

\[f(x) = - 2^{x}\]
\[f(x) = (\frac{1}{2})^{-x}\]
\[f(x) = 2^{-x}\]
\[f(x) = - (\frac{1}{2})^{x}\]

Hint

Be alert for words like better, best, most/mostly, main/mainly, major, highest, greatest, biggest, largest, priority, and primary/primarily in questions. They indicate that there might be other answers that could work, but the correct answer is the one that is the best of the choices given.

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