To solve this you must use Pythagorean theorem:[tex]a^{2} +b^{2} =c^{2}[/tex]a and b are the legs (the sides that form a perpendicular/right angle)
c is the hypotenuse (the side opposite the right angle)
In this case...
a = 5b = 8
c = x^^^Plug these numbers into the theorem
[tex]5^{2} +8^{2} =x^{2}[/tex]
simplify25 + 64 = [tex]x^{2}[/tex]89 = [tex]x^{2}[/tex]To remove the square from x take the square root of both sides to get you...√89 = x (choice A)Hope this helped!~Just a girl in love with Shawn Mendes