Integers help ? (: thank you!

Integers help ? (: thank you!?
I don't know how to evaluate these:
6+ (-7)+ (-5) - (-2)
(-3) + 5 + (-5) + 12
(-11) - 8 + 1 - (-6)
10 - (-10) -7 -5
6 - 3.98
5.8 + (-2.5)
1.8 - (-3.7)
(-0.8) + (-7.2) - 5.4

if you guys would help i would really appreciate it thanks :)

6+ (-7)+ (-5) - (-2) = -4
(-3) + 5 + (-5) + 12 = 9
(-11) - 8 + 1 - (-6) = 12
10 - (-10) -7 -5 = 8
6 - 3.98 = 2.02
5.8 + (-2.5) = 3.3
1.8 - (-3.7) = 5.5
(-0.8) + (-7.2) - 5.4 = -13.4