Does this graph represent a relation that IS a function?

Is this a function?

On a graph, which axis shows the dependent variable?

What is the rule?

Is this a function?

Grace is bringing treats to her Algebra 1 class on her birthday. The number of treats she brings is based on the number of students in her class. Which of the variables is independent?

Darla does chores every week in order to save money for a new pair of shoes. She earns $ 20 for every chore she completes. c = number of chores and  s = money saved. ( s = 20c) What is the independent variable?

Jimmy earned $8 for every pizza he delivers. m = money (dollars) p = number of pizzas delivered The dependent variable is:

What is the dependent variable in this equation? ( 50 + 4d = C)

Is this a function?

Is this a function?

Is this a function?