Answer:
z=12
Step-by-step explanation:
6*2=12
z=12
36 students have traveled outside of the United States, when there are total 120 sixth graders.
<u><em>Explanation</em></u>
The number of students traveled outside of the United States is 9 when there is total 30 sixth graders. So, the ratio of the student traveled to the total students will be 
Now there are total of 120 sixth graders in the school and lets assume the number of students traveled outside the United states is
. That means the ratio...

So, 36 students have traveled outside of the United States.
For this case, the first thing we must do is define variables.
We have then:
x: number of checks.
y: total cost.
We now write the linear function that represents the problem.
We have then:

Then, Jerome issues 10 checks in a month.
Therefore, we evaluate the function for x = 10.
We have then:
Answer:
a monthly checking account will cost him about:
y = 12.5 $