exam Maths Puzzle Numerical Ability

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

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exam Other Question

Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2??? I am having trouble with some word problems. The directions are as followed: formulate an inequality or inequalities for each scenario and find solutions, and graph each solution