Complementary angles are two angles whose measures add up to \(90^\circ\). Since \(m∠5 = 39^\circ\), you can find \(m∠6\) using the equation:
\[ m∠5 + m∠6 = 90^\circ \]
Substituting the value of \(m∠5\):
\[ 39^\circ + m∠6 = 90^\circ \]
To solve for \(m∠6\), you can rearrange the equation:
\[ m∠6 = 90^\circ - 39^\circ \]
Thus, the correct equation to solve for \(m∠6\) is:
\[ m∠6 + 39^\circ = 90^\circ \]
Answer: \( m∠6 + 39° = 90° \)