If f(x)=3x-7,g(x)=x+2/5andg-1of(x)=f(x ),find the value of x​

What is sin 7x/4 ? i need on this urgent trig

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.

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.