Arithmetic Progressions

State if the following sequence is arithmetic: $13,11,9,7,...$  

• Yes

• No

State if the following sequence is arithmetic: $-24,-16,-8,\ 0,\ ...$  

• Yes

• No

Find the common difference: $-31,\ -22,\ -13,\ -4,\ ...$  

• 9

• 2

• -11

• 3

Find the common difference: $-25,\ -23,\ -21,\ -19,\ ...$  

• 9

• 2

• -11

• 3

Find the general formula of the following arithmetic sequence: $21,\ 25,\ 29,\ 33,\ ...$  

•  $u_n=17+4n$  
  

•  $u_n=-134+100n$  

•  $u_n=-7-30n$  

•  $u_n=22+4n$  
  

•  $u_n=-34+100n$  

Find the general formula of the following arithmetic sequence: $-34,\ 66,\ 166,\ 266,\ ...$  

•  $u_n=17+4n$  
  

•  $u_n=-134+100n$  

•  $u_n=-7-30n$  

•  $u_n=22+4n$  
  

•  $u_n=-34+100n$  

Find the general formula of the following arithmetic sequence: $-37,\ -67,\ -97,\ -127,\ ...$  

•  $u_n=17+4n$  
  

•  $u_n=-134+100n$  

•  $u_n=-7-30n$  

•  $u_n=22+4n$  
  

•  $u_n=-34+100n$  

For the following arithmetic sequence: $12,\ 15,\ 18,\ 21,\ ...$ , find  $u_{36}$  

•  $117$  
  

•  $240$  

•  $-295$  

•  $-225$  
  

•  $250$  

For the following arithmetic sequence: $-30,\ -20,\ -10,\ 0,\ ...$ , find  $u_{28}$  

•  $117$  
  

•  $240$  

•  $-295$  

•  $-225$  
  

•  $250$  

For the following arithmetic sequence: $20,\ 11,\ 2,\ -7,\ ...$ , find  $u_{36}$  

•  $117$  
  

•  $240$  

•  $-295$  

•  $-225$  
  

•  $250$