Answer:
the length of DE is 1/2*9 = 4.5
Answer: Option 'B' is correct.
Step-by-step explanation:
Let the initial concentration be

Let concentration after t= 90 hours be N
Since we have given that Sodium-24 has a half life of 15 hours i.e.

So, According to question,

As we know that

Hence, Option 'B' is correct.
Answer:
40
Step-by-step explanation:
The sum equals 80 80/2=40
Answer:A,D,E
Step-by-step explanation:
Just did the assignment
14= 3k-4
_ less than _ = -
3* k simplified= 3k