What digits can be in the ones place of a number that has five as the factor

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.

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.