need help on SNR and noise figure

[n0nesense]

hi, thanks you for viewing. i already finish it. but im not sure if its correct, so please help me . thank you very2 much.

so, here it is. hope its clear
http://i253.photobucket.com/albums/hh79/n0nesense/DSC04451.jpg

 

[(*steve*)]

Wouldn't the SNR include noise from all sources?

 

[n0nesense]

meaning i have to add the thermal noise is it?
if so, then i understand. thanks a lot