ckim13 ckim13
  • 23-09-2016
  • Mathematics
contestada

the value of the 4th term is 80. the sequence is being doubled each step what is the 7th term?

Respuesta :

nobillionaireNobley
nobillionaireNobley nobillionaireNobley
  • 23-09-2016
This is a geometric sequence with common ratio (r) = 2.
an = ar^(n - 1)
a4 = a(2)^(4 - 1) = a(2)^3 = 8a
8a = 80
a = 80/8 = 10

7th term (a7) = 10(2)^(7 - 1) = 10(2^6) = 10(64) = 640
Answer Link

Otras preguntas

how can an experiment that disproves a hypothesis be useful
What is the answer to 7n + 3 = 3n + 27
ann has the 5 newest music CD's which is 3 less than twice the amount that Bob has.
Explain the process for finding the product of two integers
What is the answer to 7n + 3 = 3n + 27
What is 20 percent of 240???
james measured his hand it was 0.17 meters . Jennifer  measured her hand it was 0.165 meters whose hand is bigger how do you know . EXLPAIN.
how does geography affect where people live?
Foggy is to clear as vague it's to
a commercial jet has been instructed to climb from its present altitude of 10,000 feet to a cruising altitude of 59,000 ft. if the plane ascends to a rate of 3,