Can someone me with this question?

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

What situation is an example of an observational study

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq