Combined gas law problems

1. Initially I have a gas at a pressure of 12 atm, and a volume of 23L, when the gas is at a temperature of 200 Kelvin, if I raise the pressure of the gas to 14 atm, and increase the temperature to 300 kelvin, what is my new volume of the gas?

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth