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Finding the equation from a table, sequences?

Alright I have a table and I need to find the equation for the sequence that it represents and I'm having a hard time:

Table 1:

n | t(n)

2 | 1

5 | -8

10| -23

25|

I think the pattern is that you subtract 3 each time. Is that right? What would that equation be? I forgot the arithmetic formula...

Table 2:

n | t(n)

1| 6

2| 7.2

3| 8.64

4|

Stuck on this one, no idea

Thanks for the help.

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