Need ASAP Do the first and second pls ):

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.

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Which of the following is equal to the rational expression when x is not equal to -2 or -6?