9-10+11-12+13-14+15-16
= (9-10)+(11-12)+(13-14)+(15-16)
= -1+(-1)+(-1)+(-1)
= -4
a) (-96) + 64 = -32 b) 75 + (-325) = -250 c) |8 | + (-12) = -4
= - ( - 9 + 10 -11 + 12 - 13 + 14 -15 + 16 )
= - ( 10 - 9 + 12 - 11 + 14 - 13 + 16 - 15 )
= - ( 1 + 1 + 1 + 1 ) = - 4