help with logs

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!

Use the carrot sign for superscripts or powers. For examples,
10^4
e^x

Use the underscore sign for subscripts. For example,
F_x

Please correct your typographical mistakes too.