please explain 23 24 and 25 clear

23. Suppose that a function f is differentiable at x = 1 and f(1 + h) lim = 5 h -0 h Find f(1) and f'(1). 37 24. Suppose that a function f is differentiable at x = 2 and 3f(x) - 24 lim = 28 38 x-+ 2 x - 2 Find f(2) and f'(2). 39 25. Find the equations of all lines through the origin that are tangent to the curve y = x - 9x2 - 16x