Answer
A) $30+10a$
Work Step by Step
Since all 3 throws wrap around some bar, at least 10 points are scored for each throw, for a total of 30. An additional 10 points are scored for those throws that wrapped around the blue bar. Since a represents the number of throws that wrapped around the blue bar, an additional 10a points are scored.
The total points scored is given by the expression: $30 +10a$.
