" 40 km +</span> (40 km) + (40 km <span>− 25 km) " ;
= </span>" 40 km + (40 km) + (15 km) " ;
= " 40 km + 40 km + (15 km) " ;
= 80 km + 15 km ;
= 95 km . ____________________________________________________ <span> The answer is: " 95 km <span>" . </span>____________________________________________________
let's check the set for any repeated x-values, namely any X-Repeats, if it does have repeated x-values, then is NOT a function, if it doesn't have any repeated x-values, then it IS a function.