Geometric Sequences

Find the first term of the sequence ?, 40, -160, 640

-10

Find the next term in the sequence 5, -15, 45, ...

-135

Find the common ratio for the sequence 500, 100, 20, 4

1/5

Find the first term of the sequence: ?, 40, 160, 640.

10

Find the missing term: 3, ___, 75, 375

15

Find the first term of the sequence ?, 32, 64, 128

16

Find the fourth term of the sequence: -7, 21, -63

189

Find the next term in the sequence 3, 6, 12, ...

24

Find the common ratio for the sequence 5, 15, 45, 135

3

A Geometric sequence has a first term of 4 and a common ratio of 2. Find the 4th term.

32

Find the common ratio for the sequence 5, 30, 180, 1080

6

A Geometric sequence has a first term of 16 and a common ratio of 1/2. Find the 2nd term.

8

Find the common ratio for the sequence 2, 18, 162, 1458

9

Write the explicit formula for the given sequence 16, 8, 4, 2...

an = 16(1/2)^n-1

Write the explicit formula for the given sequence 16, 32, 64, 128...

an = 16(2)^n-1

Write the explicit formula for the given sequence 2, 1/2, 1/8, 1/32 ...

an = 2(1/4)^n-1

Write the explicit formula for the given sequence 2,4,8,16...

an = 2(2)^n-1

Write the explicit formula for the given sequence 2,6, 18,54 ...

an = 2(3)^n-1