Help please quickly1

Step-by-step explanation:

As per the problem, the given triangle is a right triangle. This is signified by the box around one of its angles, this box states that the angle it is surrounding is a right angle.

Since it is a right triangle, one can use the Pythagorean theorem to solve this problem. The Pythagorean theorem states that; (), where () and () are the legs of the right triangle, or the sides adjacent to the right angle. () is the hypotenuse or the side opposite the right angle.

Substitute in the given values and solve, note that () represents the unknown leg (side).

Inverse operations,

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.