Anyone mind helping me!?

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Nikolas calculated the volume of the prism. his work is shown below.

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?