Domain Definition and 704 Threads

I wonder what went wrong here: Find the domain of f(x)=sqrt(1-sqrt(1-x2)) So of course the term under the radical must be greater than or equal to zero. For neatness I ignore the equal part. 1-sqrt(1-x2)>0 1>sqrt(1-x2) both left and right are positive, so 1>1-x2 x2>0 But it seems to...

ok guys, I need some help. I have been working on this problem for half an hour and I am stuck. Every answer I have came up with has been wrong. Here is the problem, find the domain of this function: F(x)=square root of x^2-49 Thanks for your help.

Would resultant photographs/videos be improved by equipping (still) cameras with a voice-activated shutter or (still/video) cameras with other voice-activated functions? Mine would be, as I shake and jerk indelicate mechanical shutters. Cheese!

EKG feedback "defibrillator" - public domain Imagine placed around the chest, with an array of EKG sensors, a band of fabric positioned for determining a three-dimensional cardiac potential. Now consider this elastic array not only to diagnose immediate specific pathologies, but also to treat...