please help me with my Mathematics subject

A. For each item, solve for S'(a) using the equation f'(a) = lim /(a+h)-/(@) h -0 1. f(x) = x3 +1; a =2 2. f(x) = x2 + 2x +1;a= -3 3. f(x) = x2 - 2x - 15; a = 7 4. f(x) = x]+1;a = 1 5. f(x) = Vra =4 B. For each item, solve for the equation of the tangent line of f (x) at a. 1. f(x) =4-x2;a=-1 2. f(x) = x2 + 6x - 7;a = 0 3. f(x) =-x? + x - 6; 0 = 5 4. f(x) =x -xia=2 5. f (x ) = ba= 1 C. Solve for the derivative of the function f(x) with respect to x. 1. f(x) = x - 6x - 16 2. f(x) = 9-x