Factor the expression completely over the complex numbers.

y^4 – 16

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

What is the greatest common factor of 8 and 36

Can someone me out here and the tell me the greatest common factor