Question

A geometric sequence is shown on the graph below. What is the formula for the nth term of the sequence?

Answer 1

Answer:

C

Step-by-step explanation:

Answer 2

Remember, an=a1(r)^(n-1) where a1=first term or where n=1 and r=commmon ratio a2/a1=r so if you have the graph, find the y value coresponding to x=1 and that is a1 find the y value coresponding to x=2 and taht is a2, do a2/a1 to get r



so like I was saying

well, each term is 1/2 of the previous
20/40=1/2
so r=1/2
and a1=40
so
$a_n=40(\frac{1}{2})^{n-1}$ is da equation