9514 1404 393
Answer:
B, D
Step-by-step explanation:
The quadratic expands to ...
(2n -1)² = (2n)² +2(2n)(-1) +(-1)² = 4n² -4n +1
The coefficients can be factored out of the sum, so ...
∑(4n²) = 4∑n² for example
The sum of 60 ones is 60:

So, the sum can be written as ...

_____
It appears that the key to choosing the correct answers is paying attention to signs.
Answer:
D
Step-by-step explanation:
I just did it and got it right
I think it is
(1/3)+1+3+9+27+81+243
=364/1/3
=1093/3
Answer:
53
Step-by-step explanation:
You add up how far away each number is from 0 on the number line. 10 is 10 away from 0, -43 is 43 away from 0. 10 + 43 = 53