Question

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Answer 1

$a + b = 20$

$a - b = 10$

$a {}^{2} - b {}^{2} = (a - b) \times (a + b)$

$10 \times 20 = 200$

$log_{10}( \frac{5 \times 200}{10 {}^{2} } )$

$log_{10}(10) = 1$