book Maths Puzzle Numerical Ability

solve and write in scientific notation: (o.oo4 x 10^-5) ( 0.0003 x 10^-7

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book Other Question

Find a6 for an=8(1/2)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me. Which property is illustrated by each of the following statements?
9.2(1.5+2.3)= 9.2(1.5)+9.2(2.3)