If you multiply equation 2 by 3 , you get -6x+3y=24
if we subtract -6x+3y=24 from 2x -3y =12,
we get
2x-3y-(-6x+3y)=12-24
2x-3y+6x-3y=-12
8x-6y=-12,
After this actions we did not remove any variable, but with the elimination method we had to remove one variable, to get equation with another one variable. So 3 is incorrect
$113.00×0.45=$50.85
$113.00+$50.85= $163.85
answer is $163.85
The confidence interval is
![10.5\pm1.35 = (9.15, 11.85)](https://tex.z-dn.net/?f=10.5%5Cpm1.35%20%3D%20%289.15%2C%2011.85%29)
. This means that we can be 99% confident that the mean number of books people read lies between 9.15 and 11.85.
To find the confidence interval, we first find the z-score associated with it:
Convert 99% to a decimal: 0.99
Subtract from 1: 1-0.99=0.01
Divide by 2: 0.01/2 = 0.005
Subtract from 1: 1-0.005 = 0.995
Using a z-table (http://www.z-table.com) we see that this is associated with a z-score between 2.57 and 2.58. Since both are equally far from this value we will use 2.575.
We calculate the margin of error using
![ME=z*\frac{s}{\sqrt{n}} \\ \\=2.575*\frac{16.6}{\sqrt{1003}}=1.35](https://tex.z-dn.net/?f=ME%3Dz%2A%5Cfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%7D%0A%5C%5C%0A%5C%5C%3D2.575%2A%5Cfrac%7B16.6%7D%7B%5Csqrt%7B1003%7D%7D%3D1.35)
This means that the confidence interval is
![10.5\pm1.35](https://tex.z-dn.net/?f=10.5%5Cpm1.35)
The lower limit is given by 10.5-1.35 = 9.15.
The upper limit is given by 10.5+1.35 = 11.85
Answer:
n = 9
Step-by-step explanation:
Step 1: Simplify both sides of the equation.
1260=(n−2)(180)
1260=(n)(180)+(−2)(180)(Distribute)
1260=180n+−360
1260=180n−360
Step 2: Flip the equation.
180n−360=1260
Step 3: Add 360 to both sides.
180n−360+360=1260+360
180n=1620
Step 4: Divide both sides by 180.
180n
180
=
1620
180
Hope this helps!
=)
I think n equals 5.5. Or if you have to time the 2 ( ) then it's 4n^2-12n=-3
Hope this helps :)