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Evaluate differences between 2 (or more) items
The average of the two will be rational and it will be between them.
There are a few differences such as, the Cosmos is cheaper, Intensity 2 you can put full music songs on and other things too.
The first thing to do when tackling a sequence is note the differences between the values. In this case they are 2, 3, 4 As they are not equal, we look at the differences of the differences: 1, 1 These are equal, so the equation for the sequence begins x2/2 The sequence minus x2/2 is 6.5, 7, 7.5, 8 The differences in this new sequence are 0.5, 0.5, 0.5 Thus the equation continues x2/2 + x/2 The sequence minus x2/2 + x/2 is 6, 6, 6, 6 Thus the entire equation is x2/2 + x/2 + 6, or more simply (x2+x+12)/2 Using this equation you can find the next few numbers of the sequence: 21, 27, 34, 42, 51...
Add them together and divide by 2.