HELP NOW 6xy-2x^(2)-(3xy+4x^(2)+1)-(-xy-2x^( 2)-1)

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

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

What else equals 42 and 30 for multiply