Answer:

Step-by-step explanation:
No it definitely doesn't. it changes.
The answer would be y = 3.1
19.9 + 8 = 9y
27.9 = 9y
27.9/9 = y
3.1 = y
y = 3.1.
The answer may be 36 but I am not very sure
Answer:
the difference between the highest and lowest values in a set of numbers.
Step-by-step explanation: