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Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

If the discriminant if a quadratic equation is 4 which statement describes the roots?

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?