In decimal form, to the nearest tenth, what is the probability that a randomly selected Riverside High School student is in twel
fth grade?
2 answers:
We have that the total students there are 500. The 12-graders there are 200. Probability is defined as the ratio of positive outcomes of an event, over all the possible outcomes. Suppose we pick student randomly. Then, there are 200 positive outcomes (positive outcome: we pick a student in 12th grade) and there are totally 500 outcomes (we can pick 500 students in total from Riverside High School). This ratio gives: 
. The requested probability is 0.40
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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.
For this case we have the following quadratic equation:
Where:
Its roots will be given by:
The roots are:
Answer: