Answer:
If it is ax^2 + bx + c = 0 then it is a quadratic equation
Step-by-step explanation:
I think it’s between the first and third one
Answer:

Step-by-step explanation:
Let me know if that is not the same equation you wrote and if you have any questions !!
Answer:
5
Step-by-step explanation:
The mean represents an average of all the numbers, so we have
. Although that may seem confusing, it's actually pretty easy.
We have a total of five numbers, which are 1, 6, 2, 7, and 9.
We add these numbers up to find the sum, so 1 + 6 + 2 + 7 + 9 = 25
So our final answer will be
which can be simplified to 5.