Answer: 12 inches
Explanation:
12 inches = 1 feet
So firstly, square root 9a^2 and 49: 
Next, combine like terms, and your answer will be
, or the third option.
That would be B, C and E.
A and D could be a rhombus.
The answer is B because the x describes the domain and it can also be the input value
I the answer To You Problem Is C