Given:
• ∠A = 25 degrees
,
• ∠C = (5x + 5) degrees.
Let's find the value of x.
In a parallelogram, the opposite angles are congruent.
Angle A and angle C are opposite angles of the parallelogram, thus they are congruent angles.
Thus, we have:

Let's solve for x in the equation,
Subtract 5 from both sides of the equation:

Divide both sides by 5:

Therefore, the value of x is 4 .
• ANSWER:
c. 4