K=4d d=5 find k determine the value of the indicated variable

Which expression is equivalent to? assume x > 0 and y > 0.

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.

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?