Question

Please answer this question for 25 points !! :D

Answer 1

We know that 5 x 5 = 25, so the only answer choice with a 5 in it is 0.5

0.5 x 0.5 = 0.25, and the square root of that just equals 0.5.

Answer: C. 0.5

Answer 2

$We\ know:\ \sqrt{a}=b\iff b^2=a\\\\\sqrt{0.25}=\sqrt{\dfrac{25}{100}}\qquad\text{use}\ \sqrt{\dfrac{a}{b}}=\dfrac{\sqrt{a}}{\sqrt{b}}\\\\=\dfrac{\sqrt{25}}{\sqrt{100}}=\dfrac{5}{10}=0.5\\\\\sqrt{25}=5\ \ because\ 5^2=25\\\\\sqrt{100}=10\ \ because\ 10^2=100\\\\\sqrt{0.25}=0.5\ because\ 0.5^2=0.25$