a)[tex]\sqrt{\frac{49}{81} } *\sqrt{\frac{121}{25} } =\frac{7}{9} *\frac{11}{5} =\frac{77}{45}[/tex]
b)[tex]\sqrt{324*2*\frac{34}{81} } = \sqrt{2*4*34} =\sqrt{272} =\sqrt{16*17} =4\sqrt{17}[/tex]
c) [tex]\sqrt[3]{\frac{80}{10} } =\sqrt[3]{8} =2[/tex]
d)[tex]7+8 = 15[/tex]
[tex](\sqrt{7})^{2} =\sqrt{7} *\sqrt{7} =\sqrt{49} =7[/tex]
