A and b have the opposite directions. a has a magnitude of 7. and b has a magnitude of 6. What must be true about a and b?

A, B, C, or D.

(it's not A)

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?