Casey has been studying all week for his biology final. he studies until he is ready to go to bed because he knows that information presented within before sleep is less likely to suffer from retroactive interference.

1 hour

Explanation:

Firstly, retroactive interference is the effect of new memories holding back a person from keeping older memories. According to my research many scientists believe that if you study or read certain information 1 hour before going to sleep it greatly reduces the likely-hood of suffering from retroactive interference. Therefore it will help you remember what you read for the test the next day.

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answer; the president uses mass media to gain support for policies;

answer; obscene;