help solve for the questions in the image

10. Find lim f( xth)-f(x) . Given a) f(x) = x2 -3x b) f (x) = Vx-2 h 12.3 Find tangent line slope 11. h(x) =5-2x (1, 3) 12. f (x ) = Vx+10, (-1,3) 13. Find the derivative f (x) =- 14. Find the tangent line of f(x) = -3 at point ( 1 , 1 ) X X 15. Find the tangent line of f(x) = x2 +1 which is parallel to the line: 2x + y = 10