Based on the sample results about what percent of the population has a favorite social network

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible