Answer:
12) The correct answer is C.
13) 120 + 2x + 30 + x + 90 = 360
3x + 240 = 360
3x = 120
x = 40
BCD and DCE are supplementary
angles. BCD measures 40°, so DCE
measures 140°.
The correct answer is C.
14) The sides of a rhombus are congruent.
6x - 5 = 4x + 13
2x = 18
x = 9