Alice and bill are planning to have three children.(assume that it is equally likely for a boy or girl to be born.) the probability that all three children will be girls?

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?

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).