a) b) [tex](8.2)^{5} = 16^{5} =( 2^{4} )^{5} = 2^{4.5} = 2^{20}[/tex]
[tex]\frac{2^{7}.2^{1}.2^{4} }{2^{6}.2^{3} } =\\\\ \frac{2^{7+1+4} }{2^{6+3} } = \\\\\frac{2^{12} }{2^{9} } =\\\\2^{12-9} = 2^{3}[/tex]
