Arithmetic and Geometric Sequences

Which of the following algebraic expressions best describes the nth term of the arithmetic sequence? 7, 9, 11, 13,...

• 2 + 5n

• 5 + 2n

• 7n

• n + 5

Which of the following algebraic expressions best describes the nth term of the arithmetic sequence? -1, 3, 7, 11,...

• 5n - 4

• 4n - 5

• 4n + 5

• 4n - 1

What is NOT true about the following arithmetic sequence: 25, 32, 39, 46, ...

• The common difference is 7.

• The 7th term is 60.

• The 6th term is 60.

• The general rule is a(n) = 18 + 7n.

Work out the missing terms in this arithmetic sequence:

____, 18, ___, 8, 3, ___, -7, -12 ...

• 23, 13 , -2 ,

• -5 , -10,-15

• 23 , 13 , 5

• 20 , 15 , 10

which of the following is a geometric sequence?

• −1, 6, −36, 216, ...

• −2, −4, −8, −16, ...

• 2, 4, 6, 8, ...

• 4 , 8 , -16 , 32

Write the first term(a1) and the common ratio(r) of this geometric sequence 1/11 , 3/22 , 9/44 , 27/88, 81/176, ...?

• 1/2

• 1/4

• 3/2

• 5/4

what is the first term of this geometric sequence ____, 510, 3060, 18360, 110160, ...

• 255

• 85

• 105

• 25

The second and third term of a geometric sequence is 192 and 144 respectively , what is the common ratio?

• 1/4

• 1/2

• 3/4

• 1

The second and Fifth terms of a geometric series are 750 and -6 respectively , find the first term (a₁)?

• 3750

• -3750

• 2750

• -2750

A geometric sequence has a first term a₁ = 360 and common ratio r= 1/2, what is the fifth term?

• 20.5

• 21.5

• 22.5

• 23.5