f + 6 = ?
Well, the answer can be pretty much any number. It all depends on what number f is. f is a variable, so you can plug in any number to replace f.
For example, if f was 5, this is what the equation would look like:
5 + 6 = 11
If f was -3, this is what the equation would look like:
-3 + 6 = 3
So, again, the answer can be anything. It depends on what f is.
Answer:
To use a paired t-test
Step-by-step explanation:
t-tests are essentially tests carried out to compare two different groups to check if there is a major difference in their performances or results which may be related in certain characteristics.
A paired (correlated) t-test is used when there are matched pair of similar units or instances of repeated measurements.
In this case, Mary has to use a paired t-test because the samples (students) have high similarity in characteristics. The students in question has to be from the same class to test her hypothesis (similar characteristics).
Answer:
i think you can just divide
Step-by-step explanation:
3+4+6=13
2/13 should be the answer. i am not sure
Rewrite the right side of the equation
![2x^2-4x-5 = 0](https://tex.z-dn.net/?f=2x%5E2-4x-5%20%3D%200)
in the following way:
![2x^2-4x-5 = 2(x^2-2x)-5=2(x^2-2x+1-1)-5=2((x-1)^2-1)-5=2(x-1)^2-2-5=2(x-2)^2-7](https://tex.z-dn.net/?f=2x%5E2-4x-5%20%3D%202%28x%5E2-2x%29-5%3D2%28x%5E2-2x%2B1-1%29-5%3D2%28%28x-1%29%5E2-1%29-5%3D2%28x-1%29%5E2-2-5%3D2%28x-2%29%5E2-7)
.
Then the equation is
![2(x-2)^2-7=0](https://tex.z-dn.net/?f=2%28x-2%29%5E2-7%3D0)
and
![2(x-2)^2=7](https://tex.z-dn.net/?f=2%28x-2%29%5E2%3D7)
.
So,
![(x-2)^2= \frac{7}{2}](https://tex.z-dn.net/?f=%28x-2%29%5E2%3D%20%5Cfrac%7B7%7D%7B2%7D%20)
and
![x-2=\pm \sqrt{ \frac{7}{2} }](https://tex.z-dn.net/?f=x-2%3D%5Cpm%20%20%20%5Csqrt%7B%20%5Cfrac%7B7%7D%7B2%7D%20%7D)
The equation has two solutions:
![x_1=2+ \sqrt{ \frac{7}{2} }](https://tex.z-dn.net/?f=x_1%3D2%2B%20%5Csqrt%7B%20%5Cfrac%7B7%7D%7B2%7D%20%7D%20)
and
![x_2=2- \sqrt{ \frac{7}{2} }](https://tex.z-dn.net/?f=x_2%3D2-%20%5Csqrt%7B%20%5Cfrac%7B7%7D%7B2%7D%20%7D%20)
.