If x = -b/2a, then 2a = -b / x so a = -b / 2x or a = b / -2x
So the denominator is -2x because it has to take the minus sign that the numerator refused to take ;-)
To solve this problem you must apply the proccedure shown below:
1. By definition, the rate of change of a linear function is the slope of the line and it is constant. Based on this, you must find the slope of the given function.
2. You have the equation of the line has the following form:

Where
is the slope and
is the y-intercept.
3. Then, you have that the slope of the function
is:

Therefore, the answer is: 
Answer:
84.9
Step-by-step explanation:
R²=2.6x2.6
=6.76
6.76xπ=21.2264
21.2264x4=84.9056
Rounded to 84.9
Answer:
1196-46=x
Step-by-step explanation:
this Is the equation if you need the answer comment