# Find the value of: a).  (-2) + (8) + (-4) b).  (-7) + (-8) + (-90) + (+70) c).  ____ - 15 = (-10)

• 1
a) (-2-4)+8=-6+8= +2
b)(-7-8-90)+70= -105+70= -35
c) can be written as (-10)+15=+5
on going to the other side of equals sign , - changes to + and vice versa.

• -1
a [-2]+8+[-4]

=[-2]+8-4
=[-2]+4
=2

b [-7]+[-8]+[-90]+[+70]

=[-7]-8+[-90]+[+70]
=[-7]-8-90+[+70]
=[-7]-8-90+70
=-7-8-90+70
=-15+[-90]+70
=-15-90+70
=-105+70
=[-35]

c__-15=[-10]

=[-25]-15=[-10]
• 0
a) 2
b) - 35
c) 5
• 0
a)  [-2] + 8 + [-4]         b)  [-7] + [-8 ] + [-90 ] + [+ 70 ]           c)  __ - 15 = [-10]
= [-2] + 8 - 4                = [-7] - 8 + [-90] + [70]                          = [-15 ] + [+10 ]
= [ -2] - 4                     = [-7]- 8 - 90 + [70]                                = [-5 ]
= 2                                = [-7] - 90 + 70                                       = *  [-5] - 15 = [-10 ].
= -7-8 -90 + 70
= -15 + [-90 ] + 70
= -15 - 90 + 70
= -105 + 70
= [-35]
• 2
correct
• 0
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