Use the information provided to write the standard form equation of each ellipse. 11) Vertices: (11, 5), (1,5)
12) Vertices: (-4, 11),(-4,-15)
Foci: (9,5), (3,5)
Foci: (-4, 10), (-4, -14)

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.

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2