F(x) =
-**
2x2 + 6x + 4 if x < -4
6 – x2 if -4 < x < 12
14 if x > 12

Milk and ice cream are mixed together for a recipe. the total volume of the mixture is 1 cup. if the milk contains 2% fat, the cream contains 18% fat ,and the mixture contains 6% fat ,how much cream is in the mixture