Is a literal coefficient always a variable?

The literal coefficient of-y is

Statement (X): The literal coefficient of 2x is x. Statement (Y): The numerical coefficient of 9x^2 yz is 2.Statement (Z): 7x^2 , 4x are like terms.

What is the literal coefficient of -3z?

The literal coefficient of 7/5x is ____________

If the sum of the reciprocals of the intercepts made by a variable straight line on the axes of coordinates is a constant, then prove that the line always passes through a fixed point.

A balloon, which always remains spherical, has a variable diameter (3)/(2) (2x+1) . Find the rate of change of its volume with respect to x.

A balloon which always remains spherical has a variable diameter 3/2 (2x+1) . Find the rate of change of its volume with respect to x.

If the coefficient of real expansion gamma_(r) is 1% more then coefficient of apparent expansion, linear expansion coefficient of the material is