It's due tonight and I don't get it​

Stefan's sculpture is 7/12 foot tall. he attaches it to a base that is 1/3 foot tall. how tall, in feet, is the sculpture with the base?

There were 34 coins in a bag. jim took 15 coins out of the bag. rose put 17 coins into the bag. how many coins are now in the bag?

Liam makes fruit punch by mixing orange and pineapple juice. how much fruit punch does he make in all?