There are two complementary angles, ∠5 and ∠6 . If m∠5=39° , what equation can you write to solve for m∠6 ?

The sum of two complementary angles is always 90 degrees. So, in this case, we can write the equation:

m∠5 + m∠6 = 90°

Since we know that m∠5 is 39 degrees, we can substitute it into the equation:

39° + m∠6 = 90°