I got an answer but it seems too complicated to be correct. Please help!

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

George is putting trim around his rectangular deck, including the gate. he will need 44 feet of trim to do the entire deck. if the deck is 13 feet long, how wide is the deck?

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?