exam Maths Puzzle Numerical Ability

Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2???

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exam Other Question

4b-5=-t for the b
+5 +5
4b=-t+5
4b/4=t+5/4
b= -t+5/4

is this right? Heidi said that 6 billion can represent the area of a square. about how many units long is the square? how do you know?