Question

if n=4, the value of the expression is$28 - 12 + \sqrt{n} \div 2$A)15B)21C)17/2D)17

Answer 1

The given expression is

$28-12+\sqrt{n}\colon2$

Using the given value, we have

$\begin{gathered} 28-12+\sqrt{4}\colon2 \\ 16+2\colon2 \\ 16+1 \\ 17 \end{gathered}$

Therefore, the right answer is D.