One year, the population of a city was 193,000. Several years later it was 162,120. Find the percent decrease.

I NEED HELP ASAP

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.

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.