You drive 3.4 km in a straight line in a direction 6.9º east of north. if an alternate route to this same destination takes you straight east and then turns directly north to arrive at the same point, find the distance you would have to drive north.

B? i think so but hope that's right and answers your question

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.