#3**+2 **

First one Geometric ratio , r = 1/5 change 1 to -15 to make arithmetic with d = -20

You try the next one......or four.....

ElectricPavlov Apr 25, 2019

#4**+2 **

Second one arithmetic with d = -6 change 13 to 14.44 make it geometric with r = .76

ElectricPavlov Apr 25, 2019

#6**+2 **

1. 25, 5 , 1 geometric..... an = 25(1/5)(n - 1)

2. 25, 19, 13.....arithmetic.....an = 25 - 6(n - 1) = 31 - 6n

3. 4, 9 , 16 .......neither.. we have no common difference or common ratio...but if we changed it to 4, 10, 16.....then arithmetic ....an = 4 + 6(n - 1) = -2 + 6n

4. 50, 60, 70 ......arithmetic.....an = 50 + 10(n - 1) = 40 + 10n

5. 1/2, 3, 18 .....geometric.......an = (1/2)(6)^(n - 1)

CPhill Apr 25, 2019

#7**+1 **

** Please solve the whole problem fully**

see: https://web2.0calc.com/questions/for-each-sequence-decide-whether-it-could-be-arithmetic#r1

heureka Apr 26, 2019

#8**-3 **

Arithmetic sequences always have the same common difference (d), each number changes by the same value

Geometric sequences have a common ratio (r). The common ratio is multiplied to every number to get the next

Neither, I am assuming that you mean that the sequence has no common ratio or difference.

doorknoob Apr 26, 2019

#9**-3 **

Arithmetic sequences always have the same common difference (d), each number changes by the same value

Geometric sequences have a common ratio (r). The common ratio is multiplied to every number to get the next

Neither, I am assuming that you mean that the sequence has no common ratio or difference.

(Whoops posted that twice)

You can always use these rules for each sequence to figure out which one is which.

doorknoob Apr 26, 2019