1. Find the slope of the tangent line to the graph of f (x) = x2 + 4J1; 2. The graph below represents the velocity of a particle in motion. Use the graph to answer the following questions. a. When does the particle change direction? b. What is the acceleration of the particle for 0 S t S 2 ? c. When is the particle moving left? d. When is the particle's speed increasing