Question

3. Verify that (a + b) + c = a + (b + c) for a = -225, b = 15 and c = -3.

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Answer 1

$\boxed{\boxed{\boxed{\fbox{ANSWER}}}}$

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        $\boxed{\bold{(-225 + 15) -3}}$  

       

$(-210) -3$

${\boxed{\fbox{-213}}$

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         $\boxed{\bold{ -225 + ( 15 - 3)}}$

$-225 + 12$

$\boxed{\fbox{-213}}$

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⇒ Hence it is proved ..

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