Answer: 3) Confounding variable
Explanation:Confounding variable is the variable that indicates about the external influential factors that produces the manipulated consequences of independent and dependent variable.This variable can lead to producing useless outcomes in an experiment.
According to the question, the changes occurring in interest of student in algebra can be due to the outside factors which are not generating the actual results and thus, experiment is getting ruined.
Other options are incorrect because application variable remain same for the experiment,system variable are the variables of certain system and reliability variables describe about the variable on which dependent or stable.Thus, the correct option is option(3)
D - Check and balances.
This is a basic fundamental system of the American government, as it prevents corruption within, as each branch has its own way to check on other branches and balance the powers as a whole, hence the term "checks and balances".
I'm not exactly sure how to answer that for you, but you can use the attached file to pin-point what you are looking for.
Answer:
In the early nineteenth century, political participation rose as states extended voting rights to all adult white men. During the 1820s, the Second Party system formed in the United States, pitting Jacksonian Democrats against Whigs.
Japan invested its newfound financial growth into institution such as education and not military resulting in it taking a lead in technology 20 years later.
