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I need help for exam it’s urgent

Which of these tables represents a non-linear function?

Aregular octagon rotates 360 degrees about its center. how many times does the image of the octagon coincide with the preimage during the rotation?

What are the angle measures in triangle abc? m∠a = 90°,  m∠b = 30°,  m∠c = 60°m∠a = 60°,  m∠b = 90°,  m∠c = 30°m∠a = 90°,  m∠b = 60°,  m∠c = 30°m∠a = 60°,  m∠b = 30°,  m∠c = 90°