hopefully can help explain these, they the last question i need to do but its mainly the reason i need

A) 2x-2 Equivalent expression 2/X-2

1/2x2 Equivalent expression ½ x -2

my problem is the reasoning for these

B) Log2(8) = 4 False My Answer - Log2(16) = 4

Log16(4)= 1/4 False My Answer - Log16(2) = 1/4

Log2(1/8)= -3 True

and again here its the reasoning but for my answers

i hope u can understand that i get it but for the reasoning i just go blank :S