ANSWER:
The hypotenuse is
[tex]7\sqrt[]{5}=15.65[/tex]STEP-BY-STEP EXPLANATION:
In this case we can calculate the value of the hypotenuse by means of the Pythagorean theorem.
[tex]\begin{gathered} h^2=a^2+b^2 \\ a=7 \\ b=14 \end{gathered}[/tex]replacing
[tex]\begin{gathered} h^2=7^2+14^2 \\ h^2=49+196 \\ h=\sqrt[]{245} \\ h=7\sqrt[]{5}=15.65 \end{gathered}[/tex]