Answer:
Each month you should save $ 150
Step-by-step explanation:
First, the earnings are given per year, so we need to transform $36000/year into dollars per month. So, using a rule of three as following, we obtain:
$ 36,000 ------------- 12 months
X -------------- 1 month
Solving for X, we get:
X = $ 3,000 /month
it means that earn $36,000/year is equivalent to earn $3,000/month
Now, we need to find the 5% of $3,000, this can be calculated making the following multiplication:
Then, each month you should save $150
To solve for r, you just need to isolate r. To do that, divide by h and π on both sides:
Then, square root both sides to get rid of the 'squared':
Or, if you wanted the answer in terms of π, then just don't divide by it, just divide by h and then square root it.
Your answer for number 8 will be "B"
9.)a
Answer:
You can solve one by... it's hard to explain So i'll just show you
Step-by-step explanation:
Here's an example,
2x+7=4+5x
First you subtract the variables on both sides (lower variable)
2x+7=4+5x
-2x -2x
Which will leave you
7=4+3x
The subtract the whole number on each side (lower number)
7=4+3x
-4 -4
Which will leave you
3=+3x
Then you divide on both sides
3/3 3/3
which should leave you
x=1
Answer: 
Step-by-step explanation:
We know that the confidence interval for population standard deviation is given by :-
, where n= sample size
s = sample standard deviation.
and 
= Chi-square critical value for degree of freedom (n-1) and significance level (
).
Given : 
n= 16
Critical ch-square values for degree of freedom 15 and 
will be :
Then , the required 99% confidence interval for the population standard deviation will be :
Hence, the a 99% confidence interval for the population standard deviation :
