Answer: y = 1/2x - 9
Step-by-step explanation:
Slope formula is y = mx + b
Substitute
y = 1/2x - 9
![\frac{(15-x)!}{(13-x)!\cdot2!}=\frac{x!}{(x-2)!\cdot2!}\\ \frac{(14-x)(15-x)}{2}=\frac{(x-1)x}{2}\\ (14-x)(15-x)=(x-1)x\\ 210-14x-15x+x^2=x^2-x\\ 28x=210\\ x=\frac{210}{28}=7.5](https://tex.z-dn.net/?f=%20%5Cfrac%7B%2815-x%29%21%7D%7B%2813-x%29%21%5Ccdot2%21%7D%3D%5Cfrac%7Bx%21%7D%7B%28x-2%29%21%5Ccdot2%21%7D%5C%5C%0A%5Cfrac%7B%2814-x%29%2815-x%29%7D%7B2%7D%3D%5Cfrac%7B%28x-1%29x%7D%7B2%7D%5C%5C%0A%2814-x%29%2815-x%29%3D%28x-1%29x%5C%5C%0A210-14x-15x%2Bx%5E2%3Dx%5E2-x%5C%5C%0A28x%3D210%5C%5C%0Ax%3D%5Cfrac%7B210%7D%7B28%7D%3D7.5)
The factorial is defined for natural numbers and since 7.5 isn't one, this equation has no solutions.
First part of question states;
A poll conducted in 2013 found that the proportion of of U.S. adult Twitter users who get at least some news on Twitter was 0.52 The standard error for this estimate was 0.024, and a normal distribution may be used to model the sample proportion.
Answer:
<u>True</u>
<u>Step-by-step explanation:</u>
From the statement above and after constructing the 99% confidence interval for the proportion of U.S. adult Twitter users we can infer that the 95% confidence upper and lower bounds are 0.52 and 0.79, which means that there's a 99% confident that the true percentage of U.S. adults Twitter users who get some news through Twitter is between the upper and lower bounds of the confidence interval.
14 3/8
Hope that helps you!
Answer:
9
Step-by-step explanation:
if z=8 then z^2 would be 64, which is not equal to 80
iz z=9 then z^2 would be 81, which is closer to 80 than 64
therefore, 9 is the whole number than z would be closest to