$10.63
the work is shown below
R'S' is equal in length to RS.
length doesnt change, it was just rotated.
12x + 4
divide 4 from each monomial
12x/4 = 3x
4/4 = 1
4(3x + 1) is a equivalent expression.
hope this helps
The answer is C it will be congruent to another angle
