Hamill finds the measure of x to be 90. he justified his work by writing “ all exterior angles of a polygon are found by 360/n. which of the following statements explain why his answer is incorrect

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

What’s 8y+48 and factor each expression completely