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# Find the sum: (a) (- 7) + (- 9) + 4 + 16

5. Find the sum :

(a) $\inline (-7)+(-9)+4+16$

(b) $\inline (37)+(-2)+(-65)+(-8)$

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It is known that the sum of $-a + (a) = 0$
Therefore,
(a) $\inline (-7)+(-9)+4+16$
= - (9 + 7) + 4 + 16
=  (- 16) + 4 + 16
= 4

Also we can split the 16 into (- 9 and -7 ).

(b) $\inline (37)+(-2)+(-65)+(-8)$
= 37 + (- 37) + (- 28) + (-2) + (- 8)
= 0 - (37 + 28 + 8)
= - 73

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