book Maths Puzzle Numerical Ability

divide this problem in simplest form:

5 1/2 divided by 2 2/5

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book Other Question

Could you tell me how to use prime factorization becausem i do not understand how to do it like say for example like 525 how could i turn that in to a prime factorization Find the discriminant and describe the natue of the roots.
3x^2 + 7x - 10 = 0