exam Maths Puzzle Numerical Ability

to divide monomials and simplify expressions with negative exponents

(9ab^-2)^-2/(8a^-2b)^-2*(3a^-2b)^3/(2a^2b^-2)^3

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exam Other Question

Please help me to factor the polynimial (x^4 + y^4)(x^8 - x^4y^4 + y^8)(x^6 + y^6)(x^6 - y^6) A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book.

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