Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?

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

Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?

Look at this series: 2, 4, 6, 8, 10, ... What number should come next?

Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?

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

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

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