Discover Questions

So I'm a medium but I haven't seen or spoken to anything of the paranormal since I was 3, only sensed. Why? I'm 14 if it helps? If the pH is 10, what is the concentration of hydroxide ion? A.
10-10 B.
10-24 C.
10-4 D.
10-14? What is energy measured in joules? astronomy question? How to prove that 1^99+2^99+3^99+4^99 is a multiple of 5 ? If z=9eiπ/3 and w=3e−iπ/6 find Re(zw).?