This is Metric Measurement units I need help with My homework number 3 4 6 7 8 9 and 10 I’ll give you brainliest

(check Q2)
2. B. 20
3. A. Layla bought 20mL less than 2L
4. B. The poster is 58cm longer than it is wide
6. D. 800mg
7. A. 8
8. B. 1.505 L
9. C. The younger horse's mass is 345kg greater