Number 4, please. The question is "A gas has a temperature of 14°C and a volume of 4.50L. If the temperature is raised to 298°C and the pressure is not changed, what is the new volume of the gas?"
the new volume is 8.95 L you can use the V1P1/T1=V2P2/T2 you know the pressures are the same so the ratio of volume divided by temperature should be the same so 4.5L/287K(kelvins you add 273 to celsius)=xL(unknown volume)/571K(the new temp) this will give you the new volume!
