Are these numbers linear or nonlinear?

1. 5, 10, 15, and 20

2. 13, 28, 43, and 58

3. 1, 3, 5, and 7

4. -2, -18, -50, and -98

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# Are these numbers linear or nonlinear?
1. 5, 10, 15, and 20
2. 13, 28, 43, and 58
3. 1, 3, 5, and

Are these numbers linear or nonlinear?

1. 5, 10, 15, and 20

2. 13, 28, 43, and 58

3. 1, 3, 5, and 7

4. -2, -18, -50, and -98