Hello.
The symbols | | mean the absolute value, which is keeps the numbers postive.
Of the answers shown, the correct answer is {-8, 8) because |-8 + 2| = 10, because of the absolute value symbols | |. (Also |8 + 2| of course equals 10.)
Answer:

Step-by-step explanation:
Given

Required
Write the variables and constants on different sides

Add 2x to both sides


Add 5 to both sides



Hence, the equation is

Solving further [divide both sides by 5]

Answer:21
Step-by-step explanation:
Answer:
1
Step-by-step explanation:
if the boys go in front and the girls go in the back there is only one way to put them