Interpreting/Sketching Key Features of Functions Practice Test

The height of a tossed ball (in meters) after $t$ seconds is modeled by $h(t)=-5t^2+20t+1$. Identify the y-intercept of $h$ and interpret it in context.

A skateboard ramp’s cross-section is modeled by $f(x)=x^4-3x^2$, where $x$ is horizontal distance (meters) from the center. Does $f$ have symmetry? What type?