Let's say you want to see if another star goes through a starspot cycle like our Sun goes through a sunspot cycle. To be sure it is cyclic activity, you should watch the star for two cycles. If the other star's cycles last as long as our Sun's sunspot cycle, how long should you study the star?
about 22 years

Which of the following statements best describes the quantity theory of inflation? a. inflation occurs because production cost rise and this cost increase is passed on to consumers in the form of higher prices b. inflation occurs because there is too much money in the economy c. inflation occurs because demand of good and services exceeds existing supplies d. none of these