Question

#16 please. i just added more information for those who wanted to help.

Answer 1

There are a few ways to answer. The simplest of which is to simply say "angle 1" which is written as $m \angle 1$ or you can say "angle ELS" or "angle SLE" written as $m \angle ELS$ and $m \angle SLE$ respectively. All three of these angles represent the same idea.

It might help if you used a different color marker to help see what's going on. In figure 1 (see attached image), I've marked angle ALS in green. Then if you take out angle 2 from the angle ALS, then you'll be left over with just angle 1. Angle 2 is marked in blue and angle 1 is marked in red. This is shown in figure 2.

Answer 2

Measure of angle 1.
Angle ALS consists of angle 1 and 2. When you take the angle 2 away, subtract it, it ends with angle one.