Find (3 × 104) − (5 × 102). a) 2.905 × 102 b) 2.905 × 104 c) 2.95 × 102 d) 2.95 × 104

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?