5 to the square root of -2

Some help ASAP plss

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.

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles