16.5 is what I got for x you add them up and equal them to 180 because its a straight line
closed dot is if the number is part of the solution so if it is equal to
and
use open if it is not part of solution as in if it is greater than or less than
so for your picture x greater or equal to -2 it would be a closed dot
Mel purchased 5 shirts and Joe purchased 2 shirts.
I believe that the answer may be 1,1,1,2
