A red blood cell is 7 x 10 -6m in diameter. There are about 2 x 10-13 red blood cells in a 125-lb person. if all of the ref blood cells were lined up end to end, how long would the line be? write your answer in scientific notation i need help please

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list