Someone answer this is so hard for me i don’t know where to start or how to answer : (

The given triangle is a right angle .

In this triangle for angle A side AC is adjacent side ,BC is opposite side and AB is hypotenuse.

Sin of any angle is the ratio of opposite and hypotenuse .

Substituting the values of opposite and hypotenuse

SinA=

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

answer:

c. the third graph