Solve these equations, show all your work 7x=14

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.

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.