Ik it's prob easy ques but help me i forgot everything

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?