This is algebra, functions, and data analysis

X+ y = 5 ; x - y =3 solve using linear combination

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

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?