How to find the degree of an angle without a protractor

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.

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?