What you have so far is correct.
Problem 7 is a function because none of the x values repeat. Each x input goes to exactly one y output. The y values can repeat. If the y values repeat, then we don't have a one-to-one function.
In contrast, problem 8 is not a function. We have x = 1 go to y = 8 and y = 6 at the same time. This is one example showing we don't have one output for a given input.
With one cup you can make 3 batches.
With 7 cups you can make 7*3=21 batches.
Answer
It is 112
Step-by-step explanation:
Answer:
Option C. 
Step-by-step explanation:
we know that
In the rectangle of the figure

so

The constant is equal to 