Answer:
1. a i think
Step-by-step explanation:
2. 5.81818
Answer:
A: 8+9+10=27
9+10+11=30
10+11+12=13
B: 19+20+21
C: There isn't any.
Step-by-step explanation:
It just is lol.
Answer:

Step-by-step explanation:
Use the square of a binomial theorem
= 
Now expand the given equation:

Hope this helps :)
Have a great day!
Answer:
none of the answer above
Step-by-step explanation:
it should be
16x +8 or 8(2x+y)
group the number together according to alphabet and number