Katie won't have more than 100 shells until the 7th day
For the given geometric sequence, we have:

So the correct option is B.
<h3>
Which is the recursive formula?</h3>
Here we have the geometric sequence:

To get the initial value of the geometric sequence, we just need to replace n by 1, so we get:

Now, notice that the common ratio is (-1/3), this means that each term of the sequence is (-1/3) times the previous term.

Then the correct option is B.
If you want to learn more about geometric sequences:
brainly.com/question/1509142
#SPJ1
The first thing he has to do is take that "minus" sign through the parentheses containing the second polynomial. Some students find it helpful to put a " 1 " in front of the parentheses, to help them keep track of the minus sign. Here's what the subtraction looks like, when working horizontally.
Since t is your variable you have to assign something for it to represent and 12 is your constant so no matter what it's going to stay the same. You could do "john plants trees for a living. He gets $12 for showing up to work, and $65 for every tree he plants"