Ineed someone to solve this equation and you

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

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4