Arithmetic and Geometric Sequences

Is the sequence arithmetic, geometric or neither?: -9, -109, -209, -309, ...

• Arithmetic

• Geometric

• Neither

Is the sequence arithmetic, geometric, or neither: -2, -10, -50, -250, ...

• Arithmetic

• Geometric

• Neither

Is the sequence arithmetic, geometric, or neither? 5, 10, 15, 20, 30, ...

• Arithmetic

• Geometric

• Neither

The sequence is arithmetic. Find the common difference. -39, -33, -27, -21

• d = -6

• d = -21

• d = 6

• d = -39

The sequence is arithmetic. Find the common difference. 17, 13, 9, 5, ...

• d = 4

• d = 17

• d = 5

• d = -4

The sequence is geometric. Find the common ratio. 3, 15, 75, 375

• r = -5

• r = 5

• r = 12

• r = 3

The sequence is geometric. Find the common ratio. 4, 8, 16, 32, ...

• r = 4

• r = 2

• r = -4

• r = -2

The sequence is arithmetic. Write the rule. -40, -47, -54, -61, ...

• $a_n=-40+\left(n-1\right)\cdot-7$

• $a_n=-7+\left(n-1\right)\cdot-40$

• $a_n=-40\left(-7\right)^{n-1}$

• $a_n=\left(-7\right)\left(-40\right)^{n-1}$

The sequence is arithmetic. Write the rule. -8, 22, 52, 82, ...

• $a_n=30+\left(n-1\right)\cdot-8$

• $a_n=8+\left(n-1\right)\cdot30$

• $a_n=-8+\left(n-1\right)\cdot30$

The sequence is geometric. Write the rule. 4, -16, 64, -256, ...

• $a_n=4\left(-2\right)^{n-1}$

• $a_n=-4\left(4\right)^{n-1}$

• $a_n=4\left(2\right)^{n-1}$

• $a_n=4\left(-4\right)^{n-1}$