\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
For her birthday, Su invites her friends to the cinema. She was supposed to pay \(\textcolor{colorprop}{28}\) dollars for \(\textcolor{colordef}{4}\) tickets. Eventually, Su's parents decide to join and offer to pay.
Knowing that the price is proportional to the number of tickets, how much will Su's parents pay for \(\textcolor{colordef}{6}\) tickets (
! e \(\pi\) ( ) % AC sin cos tan 7 8 9 / \(\sin^{-1}\) \(\cos^{-1}\) \(\tan^{-1}\) 4 5 6 * \(x^2\) \(\sqrt{\phantom{2}}\) xy 1 2 3 - ln exp log 0 . = +
) ?
dollars