Sabrina spent half of her allowance going to the movies .She mowed the lawn and earned 10 dollars. What is her weekly allowance if she ended 15 dollars

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

How do you use the elimination method for this question? explain, because i really want to understand!

What is y times x by? y is __ times x