A Cepheid star is a type of variable star which means its brightness is not constant The relationship between the brightness of a Cepheid star and its period or length of its pulse is given by M 2 78 log P 1 35 where M is the absolute magnitude or brightness of the star and P is the number of days required for the star to complete one cycle What is the absolute magnitude of a star that has a period of 45 days Use a calculator Round your answer to the nearest hundredth 5 95 4 60 3 25 4 60