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Q: Is 20 12 62 a geometric or arithmetic sequence?

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8 + 4n

0.16

√12 x √20 = 3.46410161513775 x 4.47213595499958 = 15.4919333848297

1 to 4

There are infinitely many possible answers. If the missing number is the second in the sequence, it could be part of an arithmetic progression and so equal 10.4, or it could be in geometric progression and so would be 4, or harmonic progression which would give 1/0.65 = 1.54, approx. Furthermore, he missing number cold be the first or third in the sequence.

6

12

The nth term of the sequence -4 4 12 20 29 is 8n+12 because each time the sequence is adding 8 which is where the 8n comes from. Then you take 8 away from -4 and because a - and - equal a + the answer is 12. Which is where the 12 comes from. Hope I helped.

29

3, -6, 12, 4, 20, ?

25 is the next number that appears in that sequence.

The geometric mean of 10 and 20 is 14.1421356237

20

10 The sequence is given by xn = 60/n

Geometric mean of 6 and 20 = sqrt(6*20) = sqrt(120) = 10.95445

20

Give the simple formula for the nth term of the following arithmetic sequence. Your answer will be of the form an + b.12, 16, 20, 24, 28, ...

56

10. (Don't ask why.)

12

Just use the definition of geometric mean: multiply 12 x 20. Then take the square root of the result.In this case, the square root (2nd root) is used, because there are two numbers.

16

Geometric mean = sqrt(5*80) = sqrt(400) = 20

22.36068

it is 10