7.91 = 8 21.9 = 22
8 + 22 = 30
Answer:
#1. X=3 and #2. Y=9
Step-by-step explanation:
Glad i could help, give me a follow, so if you need help with any other question, im here.
it's a i think, hope this helps
Answer:
In solid matter the particles jiggle but generally do not move from place to place
