You select a marble without looking and then put it back. if you do this 75 times, what is the best prediction possible for the number of times you will pick a orange marble.

The answer is N/A.

Step-by-step explanation:

You need more information. How many marbles are there? What are all the colors? You can not answer that question without knowing the rest of the equation. Like if all the marbles were orange, then you will pick an orange one up 75 times. You need more information to answer this.

i dont think you can solve this because  

The expression is not factorable with rational numbers.

there are no like terms