Mercury is the closest planet to the Sun at a distance of 36 million miles. The closest star to the Sun is Proxima Centauri, which is 4.24 light-years away. A light-year is 5.9 ×­ 1012 miles.

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.

What is the value of x? enter your answer in the box. photo attached.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.