Can someone please explain this ASAP!!!!!

Answer:
37 in
Step-by-step explanation:
To find the missing length of the triangle you need to you Pythagorean theorem. The equation is [tex]a^{2} +b^{2} =c^{2}[/tex] so 12 is a, 35 is b and the hypotenuse is c. [tex]12^{2} +35^{2} =1369[/tex] but then we want to square root the 1369 which would equal 37.