Work Step by Step
The average resistance to happiness at age 30 is, $R=4.6-0.02(30)=4$. The average resistance to happiness at age 50 is, $R=4.6-0.02(50)=3.6$ The difference is $4-3.6=0.4$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.