Hi, there.
________
[tex]\boxed{\begin{minipage}{8cm} Complementary angles \\ Complementary angles are angles whose sum \\ is 90^\circ. \text{Using this info, let's consider this:} \\ \text{If an angle's measure is 31 degrees, what's} \\ \text{its \ complement?}\end{minipage}}[/tex]
[tex]\text{Set up an equation, letting a be the unknown angle}[/tex]
[tex]\bold{a+31=90}\\\text{Subtract 31 from both sides}\\\bold{a=59}[/tex]
Hope the answer - and explanation - made sense,
happy studying!!
