Question

In science we find that some cells divide to form two cells every hour. If you start with one cell, how many cells will there be after 7 hours?

Answer 1

It is best to make a table for this one

Hour | Cells
0 | 1
1 | 2
2 | 4
3 | 8
4 | 16
5 | 32
6 | 64
7 | 128

After 7 hours, there are 128 cells. To find this, you multiply the starting amount by two each hour.