book Maths Puzzle Numerical Ability

a+1/2 a+1/4 a+1/8 when a=2 please show

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book Other Question

Either perform the indicated operation or solve the equation, whichever is appropriate.

-5/-a^2-4 - 2/a^2-3a+2 Using the point-slope formula, what is the equation of the line that passes through the points (1, 5) and (0, 0)?