Answer:
+ 6
Step-by-step explanation:
(-2)·(-3) = + 6
(-)·(-) = +
Answer:
17c - 2
Step-by-step explanation:
Firstly, add the normal numbers together:
7c + 4 + 10c - 6
4 - 6 = -2
7c + 10c - 2
Now, the two numbers with a c value can be added together:
7c + 10c = 17c
This returns the answer:
17c - 2
Hope this helps!
Answer: 1.509
Step-by-step explanation:
The formula of Margin of Error for (n<30):-
![E=t_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}](https://tex.z-dn.net/?f=E%3Dt_%7B%5Calpha%2F2%7D%5Cdfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D)
Given : Sample size : n= 22
Level of confidence = 0.99
Significance level : ![\alpha=1-0.99=0.01](https://tex.z-dn.net/?f=%5Calpha%3D1-0.99%3D0.01)
Using the t-distribution table ,
Critical value : ![t_{n-1, \alpha/2}=t_{21,0.005}= 2.831](https://tex.z-dn.net/?f=t_%7Bn-1%2C%20%5Calpha%2F2%7D%3Dt_%7B21%2C0.005%7D%3D%202.831)
Standard deviation: ![\sigma=\text{ 2.5 dollars }](https://tex.z-dn.net/?f=%5Csigma%3D%5Ctext%7B%202.5%20dollars%20%7D)
Then, we have
![E=( 2.831)\dfrac{2.5}{\sqrt{22}}\approx1.509](https://tex.z-dn.net/?f=E%3D%28%202.831%29%5Cdfrac%7B2.5%7D%7B%5Csqrt%7B22%7D%7D%5Capprox1.509)
Hence, the margin of error for a 99% confidence interval for the population mean =1.509
Answer: 4 weeks (1 month)
Step-by-step explanation: If it took 14 hours for something half the size of the striped scarf then you will just double the time. 1 hour a day will be 28 days which is 4 weeks and almost a month.
To the risk of sounding redundant,
![\bf \begin{array}{ccccccccc} k=2&&k=3&&k=4&&k=5&&k=6\\\\ \frac{\underline{2}+2}{2(\underline{2})}&&\frac{\underline{3}+2}{2(\underline{3})}&&\frac{\underline{4}+2}{2(\underline{4})}&&\frac{\underline{5}+2}{2(\underline{5})}&&\frac{\underline{6}+2}{2(\underline{6})}\\\\ 1&+&\cfrac{5}{6}&+&\cfrac{6}{8}&+&\cfrac{7}{10}&+&\cfrac{8}{12} \end{array}](https://tex.z-dn.net/?f=%5Cbf%20%5Cbegin%7Barray%7D%7Bccccccccc%7D%0Ak%3D2%26%26k%3D3%26%26k%3D4%26%26k%3D5%26%26k%3D6%5C%5C%5C%5C%0A%5Cfrac%7B%5Cunderline%7B2%7D%2B2%7D%7B2%28%5Cunderline%7B2%7D%29%7D%26%26%5Cfrac%7B%5Cunderline%7B3%7D%2B2%7D%7B2%28%5Cunderline%7B3%7D%29%7D%26%26%5Cfrac%7B%5Cunderline%7B4%7D%2B2%7D%7B2%28%5Cunderline%7B4%7D%29%7D%26%26%5Cfrac%7B%5Cunderline%7B5%7D%2B2%7D%7B2%28%5Cunderline%7B5%7D%29%7D%26%26%5Cfrac%7B%5Cunderline%7B6%7D%2B2%7D%7B2%28%5Cunderline%7B6%7D%29%7D%5C%5C%5C%5C%0A1%26%2B%26%5Ccfrac%7B5%7D%7B6%7D%26%2B%26%5Ccfrac%7B6%7D%7B8%7D%26%2B%26%5Ccfrac%7B7%7D%7B10%7D%26%2B%26%5Ccfrac%7B8%7D%7B12%7D%0A%5Cend%7Barray%7D)
and surely you'd know what that is.