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MatCauthon
Add 17 to both sides. 
[tex]2x - 17 + 17 = 4 + 17[/tex]
Now simplify by adding applicable things on both sides. You now have 
[tex]2x = 21[/tex]
Now divide both sides by 2 to isolate the x. 
[tex]x = \frac{21}{2} [/tex]
This is, in decimal form, 10.5; solution B.
The answer is B) 10.5.

Here are the steps I used.

1. Add 17 to both sides ( 2x = 4 + 17)

2. Simplify 4 + 17 to 21 ( 2x = 21)

3. Divide both sides by 2 ( x = 21/2)

4. In decimal form its 10.5