Pls help me with solving ellipses. i need a complete solution. will mark brainliest.

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.

Solve the system of equations. y= 2x y= x^2 - 15

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base