in my book, it shows a 1915 american newspaper clipping and i have to answer questions...this is what the clipping looks like. on the right side it says:

NOTICE!
TRAVELLERS intending to embark on the Atlantic voyage are reminded that a Britian, that a state of war exists between Germany and her allies and Great Britian and her allies; that the zone of war includes the waters adjacent to the British Isles; that in accordance with formal notice given by the Imperial German Government vessels flying the flag of Great Britian, or of any of her allies, are liable to destruction in those waters and that travellers sailing in the war zone on ships of Great Britian or her allies do so at their own risk.
IMPERIAL GERMAN EMBASSY
WASHINGTON, D.C., APRIL 22, 1915

and on the right side it says:
CUNARD
(under this is the picture of a ship)
EUROPE VIA LIVERPOOL
LUSITANIA
FASTEST AND LARGEST STEAMER
NOW IN ATLANTIC SERVICE SAILS
SATURDAY, MAY 1, 10 A.M.
Transylvania, Fri May 7, 5 PM
Orduna, Tues, May 18, 10 AM
Tuscania, Fri, May 21, 5PM
LUSITANIA, Sat, May 29, 10 AM

a. who placed this notice, and why?
( the imperial german embassy??)
b. whom is the notice addressing, and what is its main message?
(..?)
c. what is the connection between the ship advertised on the right and the notice on the left?
d. what happened to the Lusitania?

if anyone can help me with any of this it would be greatly appreciated :)

Yes, the German embassy placed this notice.

What does this part say about whom the notice is addressing and the main message?
" vessels flying the flag of Great Britian, or of any of her allies, are liable to destruction in those waters and that travellers sailing in the war zone on ships of Great Britian or her allies do so at their own risk."

What do you think the connection is between the notice and the advertisement?

For the last question, check this site.
http://en.wikipedia.org/wiki/RMS_Lusitania

the notice is addressing anyone who goes in the war zone..?

Nope. Look again at this sentence:

"TRAVELLERS intending to embark on the Atlantic voyage are reminded . . ."

a. The notice was placed by the Imperial German Embassy. This can be inferred from the text at the bottom of the notice which states, "IMPERIAL GERMAN EMBASSY, WASHINGTON, D.C., APRIL 22, 1915." The reason for placing this notice was to inform potential travelers about the state of war between Germany and its allies and Great Britain and its allies, and to warn them about the dangers of sailing in the war zone.

b. The notice is addressing travelers intending to embark on the Atlantic voyage. Its main message is to remind them of the state of war and the risks associated with sailing in the waters adjacent to the British Isles. It explicitly states that vessels flying the flag of Great Britain or any of her allies are liable to destruction in those waters and that travelers who choose to sail in the war zone do so at their own risk.

c. The connection between the ship, Lusitania, which is advertised on the right, and the notice on the left is that the Lusitania is one of the ships mentioned in the schedule of departures. The notice is cautioning travelers about the dangers of sailing in the war zone, and the Lusitania is one of the ships scheduled to depart on Saturday, May 29 at 10 AM. Therefore, potential travelers need to be aware of the risks associated with sailing on the Lusitania or any other ship of Great Britain or her allies.

d. The fate of the Lusitania is that it was sunk by a German submarine on May 7, 1915. This incident, known as the sinking of the Lusitania, resulted in the loss of many lives, including American citizens. It also played a significant role in influencing public opinion and eventually leading to the United States' entry into World War I.