Bob studies for a test and jackie does not study. after the test, they compare their scores. what’s the independent variable?

Independent variable will be the amount Bob and Jackie studies

Explanation:

Let us assume that the amount a person studies varies the test score. So, here the input is the amount they study and the output is the test score. A function represents the relationship between the input and output. In function the input is the independent variable and the output is the dependent variable.

So, the test score will depend on the amount they study hence the independent variable will be the amount they study.

i would think it's food chain

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.