Hello,
<span>Density = Mass/Volume
9 = 1800/volume
9volume = 1800
volume = 200 cm^3</span><span>
</span>
The answers is 200 cm^3
Hope that helped :)
Well first you need to show the rest of the problems before i can truely help you sorry.
Well first you have to divide 3 by 4, which is 0.75 or 3/4
Last answer for the first question and in not sure about the second one