The sum of the first n natural numbers and 0=
n*(n+1)/2
Answer:
○ 
Step-by-step explanation:

I am joyous to assist you at any time.
Answer:
3.42
Step-by-step explanation:
41/12 is 3.42
He needs it 4 inches longer because 4 ft is 48 inches.
Answer:
1/3
Step-by-step explanation:
You can try it I keep getting 3 so maybe that’s the answer