Let p(x) be a continuous function that is always decreasing and concave up. If p'(4)=-2.8 and p(4)=10, answer the following questions. a) Find the limit lim P(4+h)-p(4) $140 h b) Find the equation of the tangent line to p(x) at x4. ) 1 c) Could (5,7.2) be a point on the graph of p(x)? d) Is p'(x) increasing or decreasing at x=4?