When x=2, the graph of f(x)= 2x sqrt 4x-3 Is undefined
Is increasing
Is decreasing
Has a vertical tangent
Has a horizontal tangent

Pls! does anybody know a shortcut for answering these types of questions in the future?

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?

How do i i solve this equation? -18 = x/3 + 3