Write a recursive formula for the sequence 15, 26, 48, 92, 180, ... Then find the next term.

A) an= 2an – 1 – 4, where a1 = 15; 356
B) an= 2an – 4, where a1 = 15; 356
C) an= 4 + 11 · 2n–1, where a1 = 15; 356
D) an= 3an – 1 – 19, where a1 = 15; 356

Question

Write a recursive formula for the sequence 15, 26, 48, 92, 180, ... Then find the next term.

A)    an= 2an – 1 – 4, where a1 = 15; 356
B)    an= 2an – 4, where a1 = 15; 356
C)    an= 4 + 11 · 2n–1, where a1 = 15; 356
D)    an= 3an – 1 – 19, where a1 = 15; 356

immings · Answer

2(an)-4
2(15)-4=26
2(26)-4=48
2(48)-4=92
2(92)-4=180
2(180)-4=356

anonymous · Answer

Sorry I was eating dinner um if I can ask how exactly did you choose B? What makes it recursive?