Provide an appropriate response.By direct use of the definition of a derivative, find 
if f(x) = x2 + 4.
Fill in the blank(s) with the appropriate word(s).
2x
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Find an equation of the line described. Through (-9, 3), parallel to the x-axis
A. x = 3 B. y = 3 C. y = -9x + 3 D. y = -9
Solve the problem.A team of engineers is testing an experimental high-voltage fuel cell with a potential application as an emergency back-up power supply in cell phone transmission towers. Unfortunately, the voltage of the prototype cell drops with time according to the equation 
where V is in volts and t is the time of operation in hours. The cell provides useful power as long as the voltage remains above
What will be an ideal response?
Solve.Let f(x) = (x - 6)2. Find x so that f(x) = 50.
A. -6 + 5
, -6 - 5
B. 6 + 5
, 6 - 5
C. 56, -44
D. 16, -4
Use algebraic and/or graphical methods to solve the inequality.
> 
A. 
< x < 7
B. -7 < x <- 
C. x < -7 or x > - 
D. No solution