What does this symbol mean? i originally took it to mean the intersection but now i’m not so sure. does it mean the intersection or the total or something else entirely?

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.