-31x to the second power is -3100 and -28x to the second power is -2800
Answer:
D is the one
Step-by-step explanation:
I'm guessing you mean:

If not, correct me.
So, then the perimeter of a square is just 4*A, which in this case would be:

And that would be your answer:

units²
A is proton b is electron and c is neutron
9/27 and 30%
Step-by-step explanation:
16/ 54 then reduced to 9/27
to find percent divide 16/54 to get 0.296 then round that to 0.30 multiple by 100 to change to percent which is also just moving decimal over 2 places so 30%