The total cost of a taxi is given by the sum of a fixed amount of $1.00 per ride and an additional amount of $2.30 per mile driven. Then, the total cost f in function of the total number of miles driven x is given by:
[tex]f(x)=1+2.3x[/tex]Notice that, since there is no sense in considering "negative miles driven" the domain of this function is given by:
[tex]\mleft\lbrace x\in\mathfrak{\Re }\mright|x\ge0\}[/tex]This is equivalent to state "x is a real number greater than or equal to 0"
