What is the solution to 3/4a> - 16?

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

3x + 4y = 5 x- 3y = -7 solve by substitution

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?