Pls I need help this question is really hard to find and I need this back quickly pls help me :(

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

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?