I need help solving these as i messed up the measurements while typing things in!

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

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?