Which of the following is a composite number? 61 , 13 , 63 , 31

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?