Aquickie. if n identical dice are rolled, number of possible outcomes are?

In rolling one die, there are 6 possible outcomes because each die has 4 faces. The number of outcomes when rolling n dice is equal to 6^n. By this, the number of outcomes when 2 dice are rolled is 36, 216 for 3 dice, and so on. 

3x+9+4x+x=8x+9that's the answer for your question.