Can someone plz help me with this? It's algebra, and if you can't help, plz don't answer.

Answer soon(fast) 15 pts-brainliest? for right answer with small explination a restaurant catered a party for 40 people. a child’s dinner (c) cost $11 and an adult’s dinner (a) cost $20. the total cost of the dinner was $728. how many children and adults were at the party? use the table to guess and check.(i couldn't get the graph onto the question)                                8 children and 32 adults9 children and 31 adults10 children and 30 adults12 children and 28 adults

Which is a graph of a proportional relationship?

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0