Graphing Functions Practice Test

A coordinate plane graph shows a downward-opening parabola with vertex at $(0,4)$. It crosses the $x$-axis at $(-2,0)$ and $(2,0)$. The shape is symmetric about the $y$-axis. What is the $y$-intercept of the graphed function? If you confuse an $x$-intercept with the $y$-intercept, you may choose an incorrect value.

A coordinate plane graph shows a decreasing exponential curve that passes through $(0,4)$ and $(1,2)$. The curve approaches (but never touches) the $x$-axis as $x$ increases, suggesting a horizontal asymptote at $y=0$. Which equation best matches the graph? Watch for confusing a vertical shift with a change in the base.