For Question 3,
15 ?
__ = ____
120 100
120?=1500
1500/120=12.5
?=12.5%
Question 4
I think it is $462.80
Answer: y = 5y - (-2) < 17 =5y + 16
Step-by-step explanation:
the answer is the keyboard keys getting stuck, it's something you can touch and feel, thus it's an hardware problem
1)

2)

each of other angles measures 82.5 degrees
3)

4)sorry I don't know the last one
Answer:
missing angle 32 ...........