In the figure below, central angle EGF is 120° and the are EF is 3r. What is the circle's diameter?

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.

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Which expression is rational? 6. , square root two, square root 14, square root 49