Answer:
4:6 or 2:3
Step-by-step explanation:
Since the ratio of mass of oxygen to carbon is 4:3, when there are two carbons the ratio will be 4:3*2=4:6=2:3. Hope this helps!
Answer:
-2 1/6
Step-by-step explanation:
Answer:
We need a sample size of at least 650
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find the margin of error M as such

In which
is the standard deviation of the population and n is the size of the sample.
In this problem:
We need a sample of size at least n
n is found when 
So






Rounding up
We need a sample size of at least 650
Answer:
D= f/4G-m3
Step-by-step explanation:
I believe this is it but I'm not quite sure.
you should ask a tutor as well.