What is the independent variable on this graph?

Which function families have maximums and minimums? 1.)linear absolute value functions and exponential functions 2.) linear absolute value functions and quadratic functions 3.) linear absolute value functions and linear functions 4.) linear absolute value functions and constant functions

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)