Limits at Infinity and Horizontal Asymptotes Practice Test

Let $t(x)=\dfrac{e^x}{e^x+5}$. What is the horizontal asymptote of $t$ as $x\to\infty$?

For $q(x)=\dfrac{2x^2-1}{x^3+3x}$, what is the horizontal asymptote as $x\to\infty$?