Question

Write a possible explicit rule for the nth term of the sequence: 5, 10, 20, 40, 80, ...

Answer 1

a possible eh

Answer 2

5, 10, 20, 40, 80,
5 10 20 40

an = 2an-1

Answer 3

Thank you(:

Answer 4

i forget what explicits spose to look like tho; but thats at least the pattern :)

Answer 5

an = 2 an-1

an-1 = 2 an-2

an = 2.2an-2
an = 2.2.2an-3

an = 2^3 an-3

an = 2^r an-r

when r=n we get an-n = a0

an = 2^n an-n

an = 2^n a0

Answer 6

a0 = 5 sooo

an = 5*2^n

Answer 7

awesome thanks