Step-by-step explanation:
#3 - a) (+12)+(+7)+(+5) = 24
b)9+(+3)+0+(+7) = 19
c)(+8)+3+(+7)+(+5) = 23
d)(+12)+5+(+5)+8 = 30
e)(+1)+(+2)+(+3)+(+4) = 10
#5 - a) (+3)+(+8) =11
b) (+9)+(+1) = 10
c) (+11)+0 =11
d) (-1)+ (-3) = -4
e) (-12)+(-6) = -18
f) (-4)+(-2) = -6
g)(-7)+(-2) = -9
h)(+13)+(-20) = -7,sorry at this point I'm so bored ,so i am going to give u the answers only
i) -29
j) -11
k)-15
l) 17
