Julie runs 2 miles every day after school because it reduces the stress she feels from schoolwork. julie's running habit is maintained by a reinforcer.

negative

Explanation:

The term reinforce means to strengthen, and is used in psychology to refer to any stimulus which strengthens or increases the probability of a specific response.

Negative Reinforcement  can be seen as the act of taking something negative away in order to increase a response.

Julie runs 2 miles every day after school because it reduces the stress (negative) she feels from school work (in order to increase her response in her school work).

It's 3.28 cm from the lens produces an image that is 4.11 cm in front of the lens