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which 3 are correct

a) if x= -10^4 then log10 x = -4
b)if x= 2^8 then log 2x = 8
c) log2 2= 4
d) if x= 3 then log10 3=x
e) log 10 256-2log 10 16=0
f)log 10 (a-b)= log 10 a/log 10 b
g) the gradient of the graph of y= 2e^x at x= 2 is 2e^2
h) the gradient of the graph of y= e^x at x= 2is 2e

What is your thinking on this?

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