book Maths Puzzle Numerical Ability

This is a bonus question for my algebra class, Is there a special name for x to the fourth power?

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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. Toh-toh has 83 coins worth P10.70. Some are 10 cents and the rest are 25 cents. How many of each kind does he have?