During october, blue sky inc. correctly enters a $10,000 credit to its revenues account. what conclusions can be made based on this accounting entry?

I would say that being able to enter a $10,000 credit entry means that Blue Sky is doing well in business for that month, at least if the credit is greater than the debits to the account and if the main expenses are already paid off. 

The business cycle is the periodic but irregular up-and-down movement in economic activity, measured by fluctuations in real gross domestic product (gdp) and other macroeconomic variables. a business cycle is typically characterized by four phases—recession, recovery, growth, and decline—that repeat themselves over time. economists note, however, that complete business cycles vary in length. the duration of business cycles can be anywhere from about two to twelve years, with most cycles averaging six years in length. some business analysts use the business cycle model and terminology to study and explain fluctuations in business inventory and other individual elements of corporate operations. but the term "business cycle" is still primarily associated with larger (industry-wide, regional, national, or even international) business trends.