Let $f(x)=x^2-13x19,g(x)=\frac{4}{\sqrt[\phantom{2}]{x}},$ and $h(x)=\sqrt[\phantom{2}]{21-x}.$ Find $f(0),g(0),h(0),f(a),$ and $f(-x).$

Find $f(0).$ Select the correct choice below and, if necessary, fill in the answer box to complete your choice

A$.f(0)=19$

$($Simplify your answer, including any radicals. Use integers or fractions for any numbers in the exp

B$.f(0)$ is not defned.

Find $g(0).$ Select the correct choice below and, if necessairy, fill in the answer box to complete your choice

A$.g(0)=($Simplify your answer, including any radicals. Use integers or fractions for any mumbers in the ext

$9.9^{(0)}$ is not defined.

Find M$(0),$ Select the correct choice below and, if necessary, fill in the arswer box to cemplete your choic

A$.h(0)=\sqrt[\phantom{2}]{21}$

$($Simplify your answer, Including any radicals. Use integers or fractions for any numbers in the ext

B$.h(0)$ is not defined.

Find a