Please someone help very quickly

Right Angle: 90 degrees

2 angles have to add up to equal 90 degrees, one of the angles is 69 degrees and 90 minus 69 is 21, so therefore, the missing angle is 21 degrees.

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

translate k to n and reflect across the line containing jk.