Attempt any four sub-questions from the following:

Prepare the cumulative frequency (less than types) tables from the following distribution table:

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For solving the quadratic equations x² + 8x = -15 by completing square method, find the third term.

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Find the first four terms in an A.P. When a = 10 and d = 3.

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Form the quadratic equation if the roots are 6 and 7.

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Find the value of the determinant