For e2020 the answer is C
If they have the same charge
x+x+x+x+x+x+x=-42
7x=-42
x=-6
so to check our answer
-6-6-6-6-6-6-6=-42
-12-12-12-6=-42
-24-18=-42
-42=-42
First expand:



Now combine like terms:

A coefficient is a number that is in front of an x. The number in front of the x squared term is 6.
So the answer is 6.
B because the sum of 2 sides must be GREATER than the 3rd side
<span>A = 2wl + 2lh + 2hw
The formula is above. :)</span>