Answer:
-7/2y
Step-by-step explanation:
cancel out the Z's than youre left with -7/2y :}
Answer:
The sample size required is at least 171
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.
What sample size is required?
A samle size of at least n is required, in which n is found when 
So






Rouding up
The sample size required is at least 171
Answer:
X times 3 + 4 =22
X=6
Step-by-step explanation:
22-4=18
18/3=6
135 feet is the length of the yard