The answer is false.
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Take the average of the vectors degrees. So 112.5 degrees is the direction of the resultant.
Answer: Increase, decrease
Explanation: positive reinforcement increases the likelihood of a behavior being repeated. Negative reinforcement decreases the likelihood of a behavior being repeated.
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Number 5 is A and Number 6 is i think is D
Is there a website provided in the overview of the book?
When all else fails, ask your teacher or another sharp student.