Carlotta collects stamps. She owns f stamps from France and 15 more than twice this amount of American stamps. Which expression represents the number of American stamps that Carlotta owns?
I don't see any options but I got 15+2a, a for American stamps. 15 more translates to 15 plus or plus 15. Twice the amount (of American stamps) translates to 2 times the amount (of American stamps) or 2 times a. Altogether, it's 15+2a.
