x25x+6 x29 9. Find and classify (using limits) all points ofdiscontinuity off(x) = 2x1,x$3 2k+cos(3"),x > 3 10. Find k so that the following function is continuous at x = 3? f(x) = { _ x You must use the limit definition of continuity at a point to justify your answer. 1 2x+2 11. Find the equation of the tangent to f(x) 2 at x = 5 using the limit definition of the derivative. 12. Use the limit definition of the derivative to find the slope of the tangent of f(x) = Vx 1 at any x. 13. Use the following graph ofx) to answer the following questions a Xian? x) f. m f(x) b xljg+f00 8- ngf(x) c Ilirtlsx) d 31'1le (X) e mm