Really Stuck - Need This Within An Hour if Possile Guys!

Guys im very confused with Logs etc and am struggling to answer this question, was wondering if anyone of you might know the answer to this. Would really appreciate it. Here goes.

Choose 3 options that are true statements:

A) If X=10(4), then log(10)X = 4

B) If X=10(4), then log(10)4 = X

C) The gradient of the graph of y=ex at x=1 is e

D) The gradient of the graph of y=ex at x-1 is e

E) The gradient of the graph of y=ex at x-1 is 1

F) The gradient of the graph y=ex at x = 0 is 2

G) Log(10)a - log(10)b - log(10) (a+-b)

H) Log(10)a + log(10)b = log(10)(ab)

Surely one of you Geniuses will know this. Thanks guys!