exam Maths Puzzle Numerical Ability

How do I symplify this equation?

(2^-1a^2b)^-3/4a^-9

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exam Other Question

1. Four buttons have diameters of 5/8, 3/4, 9/16, and 7/8 inches. Which button is smallest?

3. What is the perimeter of a rectangle if the length is 7/10 in. and the width is
identify the axis of symmetry, create a suitable table of values,and sketch the graph including t he axis of symmetry.

y=x^2-5x+3