Maybe this additional image can help. I. Consider the function $f(x,y)=ln(x+\sqrt[\phantom{2}]{y}).$

$a.(3\mathrm{.}5$ points$)$ What $is$ the domain $off?$ Express $itin$ set$-$

builder notation and sketch the set $in$ the $xy-$plane $at$

right.

$b.(1\mathrm{.}5$ points$)$ What $is$ the range $off?$ Express $itin$

interval notation.Sketch a contour map $of$ the function $f(x,y)=4y^2-x^2.$ Include level curves corresponding $toat$ least three

function values $f(x,y)=c$ and label each curve with its function value.