3) 2^-6 *4^-30/8^-7=2^-6*2^-60/2^-21=2^-66/2^-21=2^-45=1/2^45
4)(3.5*10^-5)*(6.4*10^2)=(3.5*6.4)*(10^-5*10^2)=22.4*10^-3=0.0224
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3) 2^-6 *4^-30/8^-7=2^-6*2^-60/2^-21=2^-66/2^-21=2^-45=1/2^45
4)(3.5*10^-5)*(6.4*10^2)=(3.5*6.4)*(10^-5*10^2)=22.4*10^-3=0.0224