Iam not sure for the awnser but maybe its 3
My guess would be the second choice - 90 degrees , I tried my best because idk if there’s a picture to this or anything :)
Given:
Time has a total of $28 after spending half of his weekly earnings on a video game and earning $10 additional dollars for mowing the lawn.
To find:
Weekly earnings at his part time job.
Solution:
Let x be the weekly earning.
He spend half of his weekly earning, i.e., 
He earns $10 additional dollars for mowing the lawn.
According to the question,



Multiply both sides by 2.

Therefore, his weekly earnings is $36.
Answer:



Step-by-step explanation:
1. Given, u = 20 , x = 4 , y = 7 , z = 10

⇒
⇒
⇒
⇒
⇒
⇒
⇒
2. 
Multiplying or dividing a positive integer by any negative integer gives a negative integer
= - 8
3. 
⇒
⇒
⇒
Hope I helped!
Best regards! :D
You would use the method:
c. SSS
That is because since you were not given any angles and only sides of the window you could only prove this with three different sides.