Use the linear approximation $tof(x,y)=\sqrt[\phantom{2}]{\frac{x+6}{y+5}}at(2,4)to$ estimate $\sqrt[\phantom{2}]{\frac{8\mathrm{.}1}{8\mathrm{.}9}}.$

$\sqrt[\phantom{2}]{\frac{8\mathrm{.}1}{8\mathrm{.}9}}$~~

help $(fractions)$

The percentage error $is$

$\%$