Question

PLEASE HELP!!!!!

Match the sequence (term) with the correct type of sequence (definition).

1). 1, 3, 9, 27, ...
2). 5, 10, 15, 20, ...
3). 20, 17, 14, 11, ...
4). 128, 32, 8, 2, ...

A).Geometric, common ratio is 0.25
B).Geometric, common ratio is 3
C).Arithmetic, common difference is 5
D).Arithmetic, common difference is 3


Match the numbers to the sentences.

Answer 1

1. 1,3,9,27,81
1*3=3
3*3=9
9*3=27........⇒ Geometric, common ratio is 3 --- B

3. 20,17,14,11
20 - 3 = 17
17 - 3= 14
14 -3= 11........⇒ Arithmetic , common difference is 3 ....D

4. 128, 32, 8, 2
32=128*1/4=128*0,25
8=32*0,25
2=8*0,25.......⇒ Geometric, common ratio is 0,25.......A