Question 12 would be: C
question 13 would be: B
This is easy
Number 2 is 20 N to the right
Number 3 is 30 N up
Both are unbalanced
Newtons 1st law of motion - an object in motion tends to stay in motion and an object at rest tends to stay at rest
<h2>
Answer:Xenon</h2>
Explanation:
The average atomic mass of an element is defined as the sum of the masses of its isotopes,each multiplied by their natural abundances.
Option A:
Argon has a average atomic mass of 
Option B:
Xenon has a average atomic mass of 
Option C:
Krypton has a average atomic mass of 
Option D:
Neon has a average atomic mass of 
So,Xenon has the highest average atomic mass.
Answer: a substance which does not readily allow the passage of heat or sound. so I think A or C but I pick A
Explanation: