a. Find the derivative function f' for the function f. b. Find an equation of the line tangent to the graph of fat (a, f(a)) for the given value of a. 12) f(x) = x + 3 7a = -1 Find the second derivative of the function. 13 ) p = 9+ 3 1 9+6 Provide an appropriate response. 14) Find all points (x, y) on the graph of y = with tangent lines perpendicular to the line y = 4x - 7. Solve the problem. Round your answer, if appropriate. 15) Water is discharged from a pipeline at a velocity v (in ft/sec) given by v = 1200p(1/2), where p is the pressure (in psi). If the water pressure is changing at a rate of 0.267 psi/sec, find the acceleration (dv/dt) of the water when p = 59.0 psi