WeBWorK using host: https://webwork-ptx.aimath.org, format: simple seed: 447

$R(x)$ and $D(x)$

These represent the number of regular price and discount tickets (respectively), sold at the performance this month, where $x$ represents the date of the month ( $1$ - $30$ ).

$r(x)$ and $d(x)$

These represent the price (in dollars) of a regular ticket and a discount ticket, respectively, where $x$ represents the date of the month ( $1$ - $30$ ).

Which expression represents the total number of tickets sold on the $12^{\rm{th}}$ day of the month?

Which expression represents the total money brought in by discount tickets on the $12^{\rm{th}}$ day of the month?

Write an expression that represents the total money brought in by all tickets on the $12^{\rm{th}}$ day of the month.