jamesdvora943 jamesdvora943
  • 17-07-2020
  • Mathematics
contestada

If a4=16 and a8=32 and an= 128 for an arithmetic sequence what is the value of n?

Respuesta :

mathstudent55
mathstudent55 mathstudent55
  • 17-07-2020

Answer:

n = 32

Step-by-step explanation:

an = a1 + (n - 1)d

a4 = a1 + 3d = 16

a8 = a1 + 7d = 32

7d - 3d = 32 - 16

4d = 16

d = 4

a4 = a1 + 3d = 16

a1 + 3(4) = 16

a1 + 12 = 16

a1 = 4

an = 4 + (n - 1)4 = 128

4 + 4n - 4 = 128

4n = 128

n = 32

Answer Link

Otras preguntas

how many times greater is one pound than one ounce?
Work out the following quantities A, half of 12=........ B,third of 30..... C, 3/4 of 60 = D, quarter of 24= E, 1/4 of 44= F,2/3 of 6 =
How many bones are there in human body? 206 or 209? break up pl.like chest,arms,face or head?
Why I should do my homework and ways to get motivated?
what are the three codes of ethics that are used by the organisers of the international Tourism Trade Show in Berlin to reduce their carbon footprint
A person wearing a blue shirt is standing in sunlight. What color(s) of light does the shirt reflect? What color(s) or light does the shirt absorb?
What word explains why you go to the bathroom more when you drink a lot of water
Which of the following statements are true of logistic growth? Select all that apply: a. As the population becomes larger, it grows more slowly. b. When the
what is the name of the chemical substance which constitutes the genes
what types of units perimeter have