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[tex]\sqrt{36\cdot64}=\sqrt{36}\cdot\sqrt{64}=\sqrt{6^2}\cdot\sqrt{8^2}=6\cdot8=48\rightarrow\boxed{\text{T}}\\\\\sqrt{36+64}=\sqrt{100}=\sqrt{10^2}=10\rightarrow\boxed{\text{R}}\\\\\sqrt{27}\cdot\sqrt3=\sqrt{27\cdot3}=\sqrt{81}=\sqrt{9^2}=9\rightarrow\boxed{\text{E}}\\\\\sqrt{17}\cdot\sqrt{17}=\sqrt{17\cdot17}=\sqrt{17^2}=17\rightarrow\boxed{\text{N}}[/tex]
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