Discover Questions

Prove that b1/s(b1) is equal to (r12*sqrt(n-2))/sqrt(1-r12^2). (The two t statistics)? What does "f of" mean in math? For example, f(x)=2x+6. What does f(x) mean? Could a human live to be 200? Why are Japanese people chubby while Koreans are not ??? I just want Koreans to be that way?? What would happen if SETI did make contact with radio signals, would our government at first try to cover it up again?