A botanist is tracking the growth of a particular plant. The height , in centimeters, of the plant after days is recorded in the table below.
| Days, | Height, (cm) |
|---|---|
| 5 | 12 |
| 15 | 20 |
| 25 | 28 |
Assuming the growth is linear, what was the approximate height of the plant when the botanist began tracking it (at days)?
4 cm
8 cm
10 cm
12 cm
