Answer:
75mm
Explanation:
The length is the ruler at the top.
If we look, the end of the leaf is past the last marked cm (7cm) on the ruler.
Each little line represents 1 mm.
There are 5 little lines past the 7cm mark.
7cm = 70mm
70 + 5 = 75mm total.
Hope this helps! Let me know if you have any questions :)