What is the answer?? Please

What is the inverse of the function f(x) = 2x + 1?

What is the point-slope form of theequation for the line with a slope of-2 that passes through (1, 4)? a y + 1 = -2(x + 4)b y-1=-2(x-4)c y + 4 = -2(x + 1)d y - 4 = -2(x - 1)

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?