Your answer is partially correct.
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.
(a) Interpret the statements f (140) = 128 and f' (140) = 6 in terms of this painkiller.
f (140) = 128 means that a patient weighing 140 pounds should receive a dose of 128 mg of the painkiller
f' (140) = 6 means that if the weight of a 140-lb patient increases by 1 lb, the dose should be increased by 6 mg
(b) Use the information in the statements in part (a) to estimate f (145).
f (145) = 166 mg
