So,

Look at all three denominators.

Factor them completely.

Putting them together, we would get the following:
Answer:
They earn $256 on the ninth day of school.
Step-by-step explanation:
A geometric sequence(in which each term is the previous term multiplied by the ratio) has the following format:

In which r is the common ratio.
We can also find the nth term as a function of the first term, by the following equation:

In which

In this question:
On the first day, $0.50. So
.
Day two $1.00, day three $2.00.
So

Then

How much do students earn on the ninth day of school?

They earn $256 on the ninth day of school.
Please get a tutor instead of going on brainly.com, and using the space needed for other people who have a legitimate question to have an answer. Other than that, what are you struggling with?
Answer:
A=-8b/9
Step-by-step explanation:
Answer:
im literally doing the same question , i hope someone helps us .
Step-by-step explanation: