The only ways I know of getting audio from a tablet to a receiver is via Wi-Fi, Bluetooth or the headphone jack. Your Denon supports Bluetooth but it is quite battery intensive for your Sammy. It sounds like the headphone jack is the way to go for you.
You'd do this by connecting to one of the Audio In connectors on the back of the receiver. You will need a 3.5mm to stereo RCA cable (see below). Make sure you don't confuse the right and left jacks when connecting to the receiver. Also make sure to choose the correct length when you order.
https://www.amazon.com/AmazonBasics...udio+cable&qid=1614627750&sr=8-3
