Kevin will take 4 math tests this term. all of the tests are worth the same number of points. after taking the first 3 tests, his mean test score is 88 points. how many points does he need on his last test to raise his mean test score to 90 points?

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?