What are the greatest common factor of 21 30

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Use the four functions below for this question. compare and contrast these four functions using complete sentences focus on the slope and y- intercept first, and then on any additional properties of each function

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)