Answer:
24
Step-by-step explanation:
6+6 =12
12+6 = 18
18+6 = 24
You cannot find the answer to 4x+120 without knowing x, otherwise it is simplified as far as it can be
Average rate of change of the function: 
Step-by-step explanation:
The average rate of change of a function f(x) can be calculated as:

where:
are the x-values of the interval taken into account to evaluate the rate of change of the function
are the values of the function at those points
In this problem, we have:

The function is
, so

So, the average rate of change in this interval is:

Learn more about rates of change:
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Answer:
10/25
10+9+6 equals 25 and there is 10 red marbles. I think this is the answer don't take my word for it.