Rocket boys what is the setting and time period who is the narrator and how old was he when his memoir begins

I don't really understand your question.

Rocket Boys (also known as October Sky) is the first memoir in a series of three, by Homer Hickam, Jr. It is a story of growing up in a mining town, and a boy's pursuit of amateur rocketry in a coal mining town. It won the W.D. Weatherford Award in 1998, the year of its release.[1] Today, it is one of the most often picked community/library reads in the United States. It is also studied in many school systems around the world. Rocket Boys was followed by The Coalwood Way (2000) and Sky of Stone (2002).

Rocket Boys was made into a film in 1999, titled October Sky (an anagram of "Rocket Boys"). The book was then re-published as October Sky shortly afterwards.

Idon’t understand the question

2.25 because you subtract the two