book Maths Puzzle Numerical Ability

how shall i find the square root of 169 without using calculator?? please describe briefly..

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book Other Question

factor completely
x^2 - 1/2x - 5/64
Please explain in detail, I want to do the rest of them myself

Solve each compound inequality. State the solution set using interval notation and graph it


4. x <= 0 and x + 6 > 3