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4. D

5. B

6. B

Step-by-step explanation:

Flowcharts are used to show the steps of a process in a subsequential order. They are not used to represent relations or functions therefore the answer is D

In a function each x value had its own corresponding y value. To be more specific the x value cannot repeat.

In answer choice A the x value 3 and -3 repeats therefore is is not a function

in answer choice b each x value has it's own y value. So this might be the answer but just to be safe let's check the other

In answer choice C the x value 2 repeats multiple times therefore it is not a function

In answer choice D the x value 4 repeats therefore it is not a function

So we can conclude that the answer is B

The dependent variable is the variable the depends on another variable to get it's value. in the description of the question it says that the number of products on his plastic bag lists INFLUENCES how many plastic bags he brings to the store.This means that the number of plastic bags depends on the number of products on the plastic bags lists. Hence the answer is B