Answer:

Step-by-step explanation:
The first partial sum is:

The second partial sum is:

Which represents the option A.
8,000,000+500,000+40,000+0,000+700+30+8 This is the expanded form of 8,540,738
4, because four times three equals twelve . Which means that it is a factor of 12. 4 is not a multiple of 3
R=11
1 squared is 1
Add ten to one and you get 11!
The model is is I think 25 mentally