Question

What is the value of $\sqrt{\frac{x+2y}{8y}}$ if $x=5.6$ and $y=3.1$ correct to 2 decimal places?

• A. 0.69
• B. 2.62
• C. 2.83
• D. 4.77

Answer 1

The correct option is A 0.69

$\sqrt{\frac{x+5y}{8y}}=\sqrt{\frac{5.6+2\times 3.1}{8\times 3.1}}$
$=\sqrt{\frac{11.8}{24.8}}=\sqrt{0.475}\approx 0.69$