Calculate the pressure produced by a force of 1500 N acting on an area of 6 m2

250 Pascals

Using the formula to calculate for the pressure: P=F/A
P(pressure)
F(force)
A(area)

You can apply it here:
P=F/A
P= 1500 N/ 6m^2
P= 250 Pa

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.