Question 1091044
{{{300 + 125(x-1)}}}
-> ${{{300}}} is constant that represent the cost of a camp for the {{{first}}} week
->{{{125}}} times each week beyond the first which is{{{(x-1)}}} (the number of weeks {{{x}}} minus first week)

so,  {{{(x-1)}}} represent 

D. The number of weeks after the first week