Answer:
1: 8
Step-by-step explanation:
Answer:
Nitrous Oxide
----------. --------
<h2>N. O</h2>
___________
Because ,the resulting Height would be Zero which won't be able to form a ∆ .
Answer: 
Step-by-step explanation:
Here the give expression is,

We can write,
( because
)

⇒ Option D is correct.
Answer:
(L-a)/d + 1 = n
Step-by-step explanation:
Let's isolate (n-1), and after that isolate n:
1) subtract a from both sides: L - a = (n-1)d
2) Divide both sides by d: (L-a)/d = n-1
3) Add 1 to both sides, to isolate n: (L-a)/d + 1 = n
Oder of operations is this;