If anyone's around who wants to help me with my Physics homework, here are the questions with which I need help. Note that this is due my midnight (my time, so about three hours for the time of me posting this,) so if it's after that, don't worry about it. If you don't have time to help, that's okay too.

How many kg of water are in 2.23 cubic inches (in3)?

1-5. Kim has a metal casting company which makes commemorative coins. She has 0.12 cubic

meters of silver which she needs to make into 1.03E5 coins of thickness 2 mm. If

she uses all of the silver, what is the diameter in centimeters of each coin?

1-6. A garden plot must have a central planting area of length 13 m and width 8 m. There is

to be a sidewalk around its edge of width w. If the total area, planting area plus sidewalk

area, is 170 m2, what is the sidewalk width w in meters?

These have me completely stumped, so any help would be much appreciated. Thanks in advance!

EDIT: I solved them all except the last one.

EDIT 2: Nevermind, solved that one too. Marking this as resolved.