book Maths Puzzle Numerical Ability

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.

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book Other Question

FIND THE SLOPE OF THE LINE THROUGH ((((4,-1) AND (-2, -8))) what is the LCD of 11(v-7) and 77(v-7)