In order to simplify the expression (b+11)2b, we need to use the concept of distributive property.
Distributive property:
The distributive property of multiplication over addition can be used when you multiply a number by a sum.

Our expression is:
2b(b+11)
Applying distributive property here :


Answer: 
1. Rate of change is 2/5
2. Rate of change is 1.5
3. Rate of change is -1x
4.Rate of change is 1/4
Answer:
Median: 8
Mode: 7
I believe this is correct.