Factor completely 7x^2-31x-20 7x^2-45x-28 5p^2-p-18 7k^2+9k 2b^2+17b+21 28n^4+16n^3-80n^2 3b^3-5b^2+2b 20n^b-97nb+30b 9p^2r+73pr+70r 4x^3+43x^2+3-x 7x^2-32x-60 9r^2-5r-10 9x^2+7x-56 10m^2+89m-9

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?