Im really stuck on this basic formula

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To calculate acoustic impedance (z), use the formula z = p * c, where p is the density and c is the speed of sound. Given that the speed of sound is 330 m/s and the density is 1.3 kg/m³, multiply these two values to find z. The calculation results in an acoustic impedance of 0.00043 kg/m²s, which can be expressed as 0.00043 x 10. Understanding this formula is essential for solving related problems in acoustics.
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what do i do to p and c to get z when

z=pc

please help i know its prob dumb but i am so stuck.
 
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what is z, p, and c
 
acoustic impedance z
density p
speed of sound c

the speed of sound is 330 ms-1
density is 1.3 kg m-3
i need to know what to do with density and spped of sound to get acoustic impendance i know the answer is 0.00043 kg m -2 s-1 x10 but i do not know how to work out the formula?
 
z=pc means z=p times c.
 
thankyou
 

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