Question

Identify the 15th term of the geometric sequence 52, 39, 29.25 ...
how would you set up this formula??

Answer 1

same as before

Answer 2

ar0+ar1...+ar14

Answer 3

a is 52

Answer 4

r is
39=52*r
r=39/52

Answer 5

52 * ((39 / 52)^14) = 0.926533297

Answer 6

Do you get it?

Answer 7

i unerstand how to plug it in but not the formula.... do you have just the formula?

Answer 8

the formula is just a definition i guess and is worth remembering.

ar^0+ar^1+ar^2 +ar^3

notice the exponent starts at 0. And goes up by 1. THerefore the ith term is actually the the exponent -1.

There is always an ar term that is worth remembering.

another thing worth mentioning is that ar^0 is just a. Because the definition of anynumber^0=1 so it is actually saying a*1 which is just a. So the first term is always a.