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The expression 13 + 90 is a _____ .

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Number of terms in a monomial is ______.

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Like terms in the expression n(n + 1) + 6 (n – 1) are ____ and _____.

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The speed of car is 55 km/hrs. The distance covered in y hours is ______.

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x + y + z is an expression which is neither monomial nor ________ .