The value of the expression is -24
This is because you distribute the -4 to both of the values in the parenthesis like this:
-4(7) + -4(-1)
This can be simplified to:
-28 + 4
Which equals -24
Hope this helps!
The answer is D, because in the step before that it was proved that the triangles were congruent and CPCTC is used after they are proved congruent.
