A is the answer. good luck
Answer:
By definition, the derivative of f(x) is

Let's use the definition for 

Then, 
Answer: The answer is 2x + 7.
Explanation: First, we need to add the numbers:
9x + 3 – 7x + 4
9x + 7 - 7x
And finally, we combine like terms:
9x + 7 - 7x
2x + 7
Answer:
slope: 1/4x, Y intercept: 8
y^2-1= 35
Move -1 to the other side. Sign changes from -1 to +1.
y^2-1+1= 35+1
y^2= 36
Square root 36:
6 and -6
Answer: 6 and -6