Jenny Lopez estimates that as a result of completing her master's degree, she will earn an additional $9,000 a year for the next 20 years. (a) What would be the total amount of these additional earnings?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.