Evaluate the following limits. Give exact answers. a. [1 point] lim (ex + 5x)4/x x-+ +00 b. [1 point] lim 2x + 3 x-+3 x2 - 6x +9 c. [1 point] lim -90vx + x2 - 3x + 216 x-+9 161 + cos (x - 9) + 2x2 - 36x [1 point] A boat leaves a dock at 2:00 PM and travels due south at a speed of 30 km/h. Another boat has been heading due east at 25 km/h and reaches the same dock at 4:00 PM. At what time were the two boats closest together