Let f( x ) = 1. X (a) Simplify (6 + h) - f(6) h Algebraically simplify your answer until you have cancelled out the factor of h in the denominator. (b) Evaluate lim f(6 + h) - f(6) h-0 h If an answer does not exist, enter DNE. (c) Determine the equation of the line tangent to y = f(x) at x = 6. y =