Answer:
The answer is option 3 .
Step-by-step explanation:
In order to find x, you have to use Pythogaras Theorem, c² = a² + b² :
[tex] {c}^{2} = {a}^{2} + {b}^{2} [/tex]
Let a = 9,
Let b = 7,
Let c = x
[tex] {x}^{2} = {9}^{2} + {7}^{2} [/tex]
[tex] {x}^{2} = 81 + 49[/tex]
[tex] {x}^{2} = 130[/tex]
[tex]x = \sqrt{130} [/tex]
