Step-by-step explanation:
[tex] \sqrt{45 + \sqrt{90} } \\ = \sqrt{45 + \sqrt{9 \times 10} } \\ = \sqrt{45 + 3 \sqrt{10} } \: \: \: \: ( \sqrt{9} = 3) \\ = \sqrt{45 + 3 \times 3.16} \\ = \sqrt{45 + 9.48} \\ = \sqrt{54.48} \\ = 7.38 \\ thank \: you[/tex]
