Ihave another question if anyone is willing to out. number 4

Which of those sequences is a geometric sequence

Which expression will have the same sum as 3_8 + 1/4?

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.