Respuesta :
total=base price+service price
so use addition because the total=the 2 prices
so it would be p(x)+c(x)=15x+10+5x+2=20x+12
addition
so use addition because the total=the 2 prices
so it would be p(x)+c(x)=15x+10+5x+2=20x+12
addition
it would be adittion as you have to add the two final prices