Carl intends to flip a coin 100xs what probability model can be used to predict whether or not a particular toss will give a result of heads

For the sequence [tex]a_{n} = 2n/(n+1)[/tex], what is the value of [tex]a_{10}[/tex]

Allen's goal is to have between 1,500 and 1,600 bottles in his collection. write and solve a compound inequality to determine the number of weeks it will take allen to reach his goal. show your work. *

Are these right ? plus what is the answer for number