What are the first 3 common multiples of 6 and 9

What is the simplified expression for 6(2(y+x))

Bill works as a waiter and is keeping track of the tips he ears daily. about how much does bill have to earn in tips on sunday if he wants to average $22 a day? tips by day tips (dollars) monday tuesday wednesday thursday friday saturday $14 $22 $28 $36

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.