Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?

Look at this series: 544, 509, 474, 439, ... What number should come next?

Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

Look at this series: 58, 52, 46, 40, 34, ... What number should come next?

Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?

Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?

Look at this series: 36, 34, 30, 28, 24, ... What number should come next?

Look at this series: 8, 22, 8, 28, 8, ... What number should come next?