How do you evaluate $- 7 - (- 16) + (- 21) - 20$ $-7- ( - 16) + ( - 21) - 20$ ?

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Answer 1 · 2017-06-19T14:39:28

See a solution process below:

First, remove all terms from their parenthesis. Be careful to manage the signs of individual terms correctly:

Recall $- \times - = +$ $- xx - =+$ and $+ \times - = +$ $+ xx - =+$

$- 7 + 16 - 21 - 20 \Rightarrow 16 - 7 - 21 - 20 \Rightarrow 16 - 48 \Rightarrow - 32$ $-7 + 16 - 21 - 20 => 16 - 7 - 21 - 20 => 16 - 48 => -32$

How do you evaluate −7−(−16)+(−21)−20-7- ( - 16) + ( - 21) - 20?