#7 and i you got the answer then explain

Liam's parents are driving three times as fast as liam is biking, but they left later than he did. if his parents caught up with him two hours after he left, how much later than liam did they leave?

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

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?