Answer:
C
Step-by-step explanation:
[tex]x^{2} + 7^{2} = \sqrt{65}^{2}[/tex]
[tex]x^{2} + 7^{2} = 65[/tex]
[tex]x^{2} + 49 = 65[/tex]
[tex]x^{2} = 16[/tex]
[tex]x = 4[/tex]
