Answer:

Let's evaluate the given expressions and follow the rules for adding integers:

   (−5)+(−11)−5(−5)+(−11)−5

   =−5−11−5=−5−11−5

   =−16−5=−16−5

   =−21=−21

   6+(−9)6+(−9)

   =6−9=6−9

   =−3=−3

   −4+(−4)−4+(−4)

   =−4−4=−4−4

   =−8=−8

   7+(−6)7+(−6)

   =7−6=7−6

   =1=1

   (−8)+6(−8)+6

   =−2=−2

   18+(−11)+318+(−11)+3

   =18−11+3=18−11+3

   =10=10

   (−9)+(−19)+(−6)(−9)+(−19)+(−6)

   =−9−19−6=−9−19−6

   =−34=−34

   (−4)+25+(−15)(−4)+25+(−15)

   =−4+25−15=−4+25−15

   =6=6

   50+(−13)+(−12)50+(−13)+(−12)

   =50−13−12=50−13−12

   =25=25

   (−100)+48+49(−100)+48+49

   =−100+48+49=−100+48+49

   =−3=−3

Step-by-step explanation:

Rules for Adding Integers:

   When you add two integers with the same sign, add their absolute values and keep the sign.

   When you add two integers with different signs, subtract the smaller absolute value from the larger one, and keep the sign of the integer with the larger absolute value.

   The sum of any integer and zero is the integer.

In the given expressions, we applied these rules to find the results.