A. 6x + 4x - 6 = 24 + 9x
10x -6 = 24 + 9x
+6 +6
10x = 30 + 9x
-9x -9x
1x = 30 this has an infinite number of solutions.
Answer:
2/27 mile per minute
Step-by-step explanation:
Answer: yes.
Step-by-step explanation:
Neither only 7×2=14 4,6 is not = to 14 neither
2,5
Answer: 471
Step-by-step explanation:
Given : The population standard deviation is estimated to be $500.
i.e . ![\sigma=\$500](https://tex.z-dn.net/?f=%5Csigma%3D%5C%24500)
If a 97 percent confidence interval is used and an interval of $100 is desired.
i.e. Margin of error = half of interval
i.e. E= ![\dfrac{\$100}{2}=\$50](https://tex.z-dn.net/?f=%5Cdfrac%7B%5C%24100%7D%7B2%7D%3D%5C%2450)
Significance level : 1-0.97=0.03
Critical value for 97% confidence interval : ![{z_{\alpha/2}=z_{0.03/2}=2.17](https://tex.z-dn.net/?f=%7Bz_%7B%5Calpha%2F2%7D%3Dz_%7B0.03%2F2%7D%3D2.17)
Formula for sample size :
![n=(\dfrac{z_{\alpha/2}\ \sigma}{E})^2\\\\=(\dfrac{2.17\times500}{50})^2\\\\=470.89\approx471](https://tex.z-dn.net/?f=n%3D%28%5Cdfrac%7Bz_%7B%5Calpha%2F2%7D%5C%20%5Csigma%7D%7BE%7D%29%5E2%5C%5C%5C%5C%3D%28%5Cdfrac%7B2.17%5Ctimes500%7D%7B50%7D%29%5E2%5C%5C%5C%5C%3D470.89%5Capprox471)
Hence, at-least 471 cardholders should be sampled.