Answer:
Number 1 is a function. If you can draw a vertical line through the line graphed and it doesn't pass through it twice, it is considered a function.
Number 2 is B.
Number 3 is A. **I don't know this one for certain, but I graphed A and B for you.
I don't know number 4.
Number 5 is Beatz on Demand. This company charges $5.99 a month, while iTunez charges $8.99 a month.
Step-by-step explanation:
Below is the graph for number 3.
Answer:
x = 10
Step-by-step explanation:
y = 2x + 1
21 = 2x + 1
21 - 1 = 2x
2x = 20
x = 10
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