Describe the following sequence as arithmetic, geometric or neither.
2, 4, 6, 12, 14. .

If it was arithmetic each term would be the same difference from the previous term...

4-2 does not equal 12-6 so this is not an arithmetic sequence.

If it was a geometric sequence each term would be a constant ratio when compared to the previous term...

4/2 does not equal 6/4 so this is not a geometric sequence.

So this sequence is neither.

One unique triangle, because those angles add up to 180, and that's how many degrees there are in one triangle.