Answer:
The sum of two negative integers is always negative.
Step-by-step explanation:
For example, add -1+-1 which =-2, which are the smallest neggative numbers possible.-100+-100=-200, and -4+-4=-8, so you see that the sum of two negative integers should always be negative.
1. Length is 14 cm
2. Length is 20.4 cm
3. Not completely sure about 3
(Sorry hope this helps)