what is 16 from the square root of 600?

Makes more sense now...I wasn't sure what "16 from" meant

$${\sqrt{{\mathtt{600}}}} = {\mathtt{24.494\: \!897\: \!427\: \!8}}$$

Other than that I'm not sure what you mean...

8.4948

From means to take out, or subtract from, so you would find the square root of 600 first [which is about 24.495 or 10*sqrt(6)] and then subtract 16 from that number. so 24.495 - 16