Answer:
7°
Explanation:
for this paralellogram to be a square, the sides should be perpendicular.
Woch means that 4x+17° = 45° 
● 4x +17° = 45° 
Substract 17 from both sides.
● 4x +17°-17° = 45°-17° 
● 4x = 28° 
Divide both sides by 4 
● 4x/4 = 28°/ 4 
● x = 7°