24 cent is _ percent of 80 cents

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

This is different from the first one can someone me

The suare root of 9x plus 7 plus the square rot of 2x equall to 7