Answer:
A. 12
Step-by-step explanation:
The square root of the sum of 4 and a certain number is 4.
[tex] \\ \tt{} \sqrt{ 4 + x} = 4 \\ \\ [/tex]
What is the number?
[tex]\\ \tt{} \sqrt{4 + x} = 4[/tex]
[tex]\\ \tiny{}\tt{}square \: \: both \: \: side [/tex]
[tex]\\ \tt{}4 + x = 16[/tex]
[tex]\\ \tt{}x = 16 - 4[/tex]
[tex]\\ \boxed{ \large \boxed{\tt{}x = 12}}[/tex]
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[tex] \gamma \\ \huge \boxed{ \ddot \smile}[/tex]
