Nine Increased by the product of a number and 4 is greater than or equal to -15 Use the variable y for the unknown number

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.

100 points, hi, i’m not sure how to get the equation from the graph and table.

Problem 3 a bank charges a service fee of $7.50 per month for a checking account. a bank account has $85.00. if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative