For some painkillers, the size of the dose, D, given depends on the weight of the patient; W. Thus, D = f(W) , where D is in milligrams and W is in pounds_ Part (a). Interpret the statements f(140) 120 (include units with your answer) Part (b). Interpret the statements f' (140) = 2.( include units with your answer) Part (c). Use the information in the statements in part (a) and part (b) to estimate f(143.5) (show work and include units')