<span>What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 125 pm? </span>393pm
Answer:

Step-by-step explanation:
By the exterior angle theorem,

Group like terms and solve for x.


Divide both sides by 19;

Since they are congruent, cpctc,
just set the congruent parts equal to each other.
so 2x-20=30
and
15=3y-9
Answer:
I say Mean.
Step-by-step explanation:
Mean (Average): 23
Mode(most common): 21
Median(Middle): 21