Poverty plays a large role in determining whether a student completes high school. students from lower-income households less likely to complete high school than are middle- and higher-income students.

The answer to this question is "Three times" such as when Poverty plays a large role in determining whether a student completes high school.
The students from lower-income households or from less fortunate families whose parents are struggling are THREE TIMES less likely to complete high school than are middle- and higher-income students.

3. i would say one, but one is not prime nor composite.

What was the length to begin with?