Simplify b ( a + b ) - a ( a - b ). a2 + 2 ab + b2 a2 - 2 ab + b2 - a2 + 2 ab + b2 - a2 - 2 ab - b2

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?