<h3>
Answer: 3/5</h3>
Work Shown:
3 blue + 3 red = 6 pens that are either blue or red
4 black + 3 blue + 3 red = 10 pens total
6/10 = 3/5 is the probability of selecting either blue or red
3/5 = 0.60 = 60%
Your average rate of change for the interval is 3/2 or 1.5, so that should be your answer.
I would try Khan Academy. He does very good explainations
Sry not sure this one is very confusing
