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Evaluate each expression.

1. $7+(-3)$

Which one has the greater absolute value? That determines the sign of the answer.

$4$

1. $(10)(-5)$

If there is one negative in a multiplication problem, the answer will be negative

1. $-5+6$

See part (a).

1. $(-2)\div(-2)$

Division rules for the signs are the same as multiplication

$1$