Answer: Choice A
The number line graph is visually showing every number that is 19 or smaller; hence 
Note the use of a closed or filled in circle at the endpoint (in contrast to an open circle). This indicates we are including the endpoint 19 as part of the solution set, and that's why we go for "or equal to" as part of the inequality sign.
Answer:
you add your number and then you subtract it so all the other steps are are going to be the exact same
Answer:
18.9
Step-by-step explanation:
All of them except for letter Z