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.
X - The total cost
3 persons
Below $120 p/p
Then
120 * 3 = 360
X < 360/3
Answer:
C.
Step-by-step explanation:
6≤x<21
Answer:
4x + 22
Step-by-step explanation: