Question

Compute each of the following:

(a) 15 + (-5) + 15 + (-7)
(b) 34 + (-20) + 16 + (-10)
(c) 32 + 16 + 9 + (-70)
(d) -3 + (-2) + (-5) + 7

Answer 1

a.. 18
b.. 20
c.. -13
d.. -3..



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Answer 2

Hi there!
Here's the answer:

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We have
a + (-b) = a - b


a) 15 + (-5) + 15 + (-7)

=> 15 - 5 + 15 - 7
= (15+15) - (5+7)
= 30 - 12
= 18

(b) 34 + (-20) + 16 + (-10)

=> 34 - 20 + 16 - 10
= (34+16) - (20+10)
= 50-30
= 20

(c) 32 + 16 + 9 + (-70)

=> 32 + 16 + 9 - 70
= (32+16+9) - 70
= 57 - 70
= -13

(d) -3 + (-2) + (-5) + 7

=> -3 -2 -5 +7
= -(3+2+5) + 7
= - 10 + 7
= -3

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Hope it helps