Interpreting/Sketching Key Features of Functions Practice Test

For the function $g(x)=x^4-2x^2$, does the function have symmetry? If so, what type?

A roller coaster’s height (in meters) above the ground is modeled by $H(x)=-(x-2)^2+9$, where $x$ is the horizontal distance (in meters) from the start of a section of track. What is the maximum of $H(x)$?