Segment DF is 1/2 the length of Segment DE. Since the entire segment is DE and it's midpoint is at F, the segment would be broken into 2 equal segments in one. Segment DF and FE. Segment DF is congruent to Segment FE.
One way is that you can just factor it out: (x+2)(x+2)(x+2)
For the first pair, you get

.
Then do

*

That will be

So the answer is 6
X = 9
Add both values 7 + 2 = 9, which is x.
9 - 2 = 7.
The answer is 0.5. I hope this is helpful.
10÷5/6
When dividing a number by a fraction, it is the same as multiplying by its reciprocal (the fraction flipped over)
so..
10÷5/6= 10×6/5= 60÷5= 12