Answer:
146 adult tickets were sold
Step-by-step explanation:
subtract 73 from 573 which = 500
then you'll take away 500 from 73 =427
then you will subtract 427 from 573= 146
See below
<u>Convert equation to vertex form </u><u> by completing the square:</u>
<u>Vertex:</u>
<u /><u />
<u>Directrix:</u>
<u />
3x+7