-18 + 16 = -2
16 positive is.
16 + 16 + 18 + 18 = 68
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
-16. A negative+a negative=negative.
-2 + (-18) = -20
It is: -16+(-14) = -30
-16
-16 + - 40 = -(16 + 40) = -56
-16+(-10) = -26
18-(-16) = 34
-16 .
-2