I attempted the first to come as far as this-:
Taking x+3 = n,
I've forgotten exponential mathematics it seems..
Pardon me if I seem like a total noob, but I need help :P
I'm not so good at French, but still..:P
Ok, the last problem. And this one isn't so sweet as the others were...
There's a modulus sign...there are separate ways of solving modulus problems..I guess I have to integrate those ways.
But yeah, better off is to ask you =P