Respuesta :

birdgod

Answer: C

Step-by-step explanation:

[tex]a^{2}[/tex] + [tex]b^{2}[/tex] = [tex]c^{2}[/tex]

121 + 324 = 455

Therefore,

[tex]\sqrt{121}[/tex] + [tex]\sqrt{324}[/tex] = [tex]\sqrt{455}[/tex]

11, 18,  [tex]\sqrt{455}[/tex] which is also 21.33