There are two annotated angles of 5y and 60 degrees, and two annotated length x + 4 and 3 x - 6. Find x so that the quadrilateral is a parallelogram.
Choices:
A:3
B:5
C:12
D:18
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: There are two annotated angles of 5y and 60 degrees, and two annotated length x + 4 and 3 x - 6. Find x so that the quadrilateral is a parallelogram.
Choices:
A:3
B:5
C:12
D:18
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: There are two annotated angles of 5y and 60 degrees, and two annotated length x + 4 and 3 x - 6. Find x so that the quadrilateral is a parallelogram.
Choices:
A:3
B:5
C:12
D:18