What is 4 times 4 to the negative 3 power times 4 to the 2 power

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 the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.