Answer:

Given:

Step-by-step explanation:

Identity used:

Answer: The value of x is 28.
Step-by-step explanation:
Since line m is parallel to line l.
So, we assume that
(3x+21)° and (4x-7)° are corresponding angles.
And we know that , corresponding angles formed when a transversal cut the parallel line are equal.
So, they must be equal to each other.

Hence, the value of x is 28.
Answer: 121
Step-by-step explanation:
Answer:
every answer is correct
Step-by-step explanation: