The average blue whale gains weight at a constant rate each day during its first six months of life the relationship between the average blue whales weight in tons w and its age in days d for the first six months of its life can be modeled by the function w=0.1d+3 based on this relationship which statement is not true about blue whales

a. the average blue whale weighs 3 tons at birth
b. when the average blue whale is 5 days old it weighs 20 tons
c. the average blue whale gains 0.1 ton per day during its first six month of life
d. when the average blue whale weighs 18 tons it is 150 years old