A) 2x-7=13
2x=20
x=10
B) 3x+4=25
3x=21
x=7
Answer:
Any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g., iron, manganese, chromium, and copper. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored.
Step-by-step explanation:
The correct answer is the first option.
If you want to use elimination, you can sum the two equations for example, so that the x's simplify:



Plug this value for y in one of the equations to derive the value of x:

So, the solution is 
Answer:
13
Step-by-step explanation:
3h - j
3(8) - 11
24 - 11
13
He volume of the right rectangular prism is 120