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arithmetic; common difference; 8

Step-by-step explanation:

Let's first define arithmetic and geometric sequences:

Arithmetic:

Arithmetic sequences are made up of successive terms that share a common difference. In other words, if the sequence is, say: a, b, c, d, then we know that: d - c = c - b = b - a

Geometric:

Geometric sequences are made up of successive terms that share a common ratio. In other words, if the sequence is, say: e, f, g, h, then we know that:

h/g = g/f = f/e   (where the / denotes division)

Here, let's try applying the arithmetic sequence rule to the three terms:

2, 10, 18

18 - 10 = 8

10 - 2 = 8

Ah, we see that the common difference is indeed 8, so this is an arithmetic sequence.

Thus, the answer is: arithmetic; common difference; 8.

~ an aesthetics lover

b

step-by-step explanation:

the word superfluous means unnecessary

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

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