Write your answer in simplified, rationalized form. Do not round.
EF =

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a

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.