1. What percent of cells were in interphase?
the percent of the cells that were in interphase was 51.4%
2. What percent were in mitosis (total of every phase except interphase)?
the percent of the cells that were in mitosis is 71.5%
3. Which phase of mitosis (not interphase) takes the longest according to your data? Why do you think that is?
the phase that takes the longest is prophase because there were a lot of that and very little metaphase
4. How can you recognize a cell in interphase?
most of the time you can recognize it by you benign able to seen the nucluse sometimes u can't
5. How can you recognize a cell in metaphase?
you can tell the cell is in metaphase by seeing the cell is starting to pull apart
6. How might you figure out how long (in minutes and/or seconds) each phase of the cell cycle takes based on the data from these onion root cells? Explain your logic and show your calculations and results below.
I do not now the answer I am not going to guess what it is either 
| Interphase | prophase | metaphase | anaphase | Telophase | ||
| number of cells | 18 |  19 | 3 | 2 | 1 | 35 |
| percent of cells | 51.4 | 54.3 | 8.6 | 5.7 | 2.9 | 100% |
http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/assignment.html
