book Maths Puzzle Numerical Ability

The height of a triangle is twice the base. The area is 9 square inches. find the area.

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book Other Question

How would I solve the inequality for the equation x - 1/x^2 < 0? I came up with the answer of (0,1). Would this be the correct answer or show me how to work for the correct answer. "find the fifth,tenth, and hundredth terms of each sequence."
14,14,24,34...