Seq and Series

State if the sequence 1,9, 25, 49, 81, ... is arithmetic, geometric, or neither.

• Geometric

• Arithmetic

• Neither

Which statement is true about this formula?

• It is an EXPLICIT formula. The first four terms are -1,2,7,14

• It is a RECURSIVE formula. The first four terms are -2,2,0,-2

• It is an EXPLICIT formula. The first four terms are -1,-3,7,47

• It is a RECURSIVE formula. The first four terms are -2,-6,-18,-36

Which statement is true about this formula?

• It is an EXPLICIT formula. The first four terms are 5,7,9,11

• It is a RECURSIVE formula. The first four terms are 5,13,29,61

• It is an EXPLICIT formula. The first four terms are 13,15,17,19

• It is a RECURSIVE formula. The first four terms are 13,29,61,125

Which statement is true about the sequence 15,25,35,45,...?

• It is arithmetic with a common difference of 5.

• It is geometric with a common ratio of 5/3.

• It is arithmetic with a common difference of 10.

• It is geometric with a common ratio of 10.

Which of the following represents the series 2+5+8+11+14+17+20?

• 
• 
• 
• 

• 2400

• 2450

• 4800

• 9700