Given the system with is the value of x-y 2x+y=-18 x-y=24

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

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?