The grаph (curve) belоw mоdels the temperаture T(x), in degrees Fаhrenheit, оf a human body as a function of the number of x hours after death, assuming that the temperature of the surroundings is 40oF. The tangent line at x=4 is graphed below as well. a) Approximate T'(4) and explain what this value means in context. b) Find a linear approximation of the temperature at 4 hours after death. c) Use your linear approximation to approximate a body's temperature 4.5 hours after death. Type your responses here. Show how you got the values on your paper (2 points).