Two quick density questions?

Question #1: Copper has a density of 8.92 g/mL. What mass of copper will occupy 45 mL? What volume of copper will have a mass of 1.0 kg (1000g)? Use significant digits.

I got these answers, but am not sure if they're correct:
Part 1: 4.0 X 10^2 g
Part 2: 110 mL

Question #2: The density of quartz was determined by adding a weighted sample to a graduated cylinder containing 56.3 mL of water. After submerging the quartz, the water level was 68.2 mL. The mass of the quartz was 36.5 g. What was the density of the quartz. Use significant digits.

I got this answer, but again I'm not sure if it's correct:
3.07 g/mL

Thanks for any help you can give me!

Answer:
I believe you are correct. The first posted answer divided by the density instead of multiplying.

45mLCu x 1gCu/8.92mLCu = 5.0 g Cu

1.0kgCu x 1000gCu/1kgCu x 1mLCu/8.92gCu = 112mLCu (110mLCu, two sig figs)

68.2mLH2O - 56.3mLH2O = 11.9mLQ

36.5gQ/11.9mLQ = 3.07g/mL Q

Q1:
P1: 401.4g = 4.014*10^2g
P2: 112.1076mL = 1.121076*10^-1 L
Q2:
Density is: 3.06723 g/mL

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Two quick density questions?

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