Answer:
the equation would be (3∙18.50)+2x=104.50
Explanation:
So you would do BEDMAS. First answer what in the brackets (3 ∙ 18.50=55.50)Then you subtract 55.50 on both sides
2x=104.50. then you just divide two by each side and the x will equal 24.50 So they parents tickets were 24.50.
Hope you get it if you need more explaining just ask. :D