B.
7cd, -12cd
Explanation;
Like terms have similar variables.

The average of 45 and 19 is
32.
Well, the first line has a slope of -3, and runs through 0, -1.
a line parallel to that one, will have the same exact slope of -3.
now, we know about this other parallel line that it runs through -3,1, and of course, since is parallel, it has a slope of -3
34! Find the area of each of the six sides and then add them up:)