Question

a)7-(-6)-(-8)
b)-21-7-6-(-15)-2-(10)
c)-28+71+(+12)+(-1)-6

Answer 1

a)
= 7 - (- 6) - (- 8)
= 7 + 6 + 8
= 13 + 8
= 21
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
= - 21 - 7 - 6 - (- 15) - 2 - (10)

= - 28 - 6 + 15 - 2 - 10

= - 34 + 15 - 12

= - 34 - 12 + 15

= - 46 + 15

= - 31
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)

= - 28 + 71 +(+12) + (-1) - 6

= - 28 + 71 + 12 - 1 - 6

= - 28 + 83 - 7

= - 28 - 7 + 83

= - 35 + 83

= 83 - 35

= 48

Answer 2

A)7-(-6)-(-8)        7 + 6 + 8 ==> 21
============================================
b)-21-7-6-(-15)-2-(10)

  -21-7-6+15-2-10

-34 + 3 ==> - 31
==============================================
c)-28+71+(+12)+(-1)-6
    
    -28+71+12-1-6
 
+ 43 + 5 ==> 48