For this infinite geometric series 36+18+9 find r

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

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Which number completes the inequality? 2/3 < _ < 7/9