a. [tex]\sqrt{\sqrt{400} :5 } = \sqrt{20:5} = \sqrt{4} = 2[/tex]
b. [tex]\sqrt{\sqrt{36}+\sqrt{100} } = \sqrt{6+10} = \sqrt{16 }= 4[/tex]
c. [tex]\sqrt[3]{25\sqrt{25} } = \sqrt[3]{25*5} = \sqrt[3]{125} = 5[/tex]
d.[tex]\sqrt{\sqrt{8\sqrt[3]{2\sqrt[3]{64}}}} = \sqrt{8\sqrt[3]{2*4}} = \sqrt{8\sqrt[3]{8}} = \sqrt{8*2} = \sqrt{16} = 4[/tex]
