Boyle's law says that the volume of a gas varies inversely with the pressure. when the volume of a certain gas is 5l, the pressure is 512 kpa(kilopascals). what is the pressure when the volume is 4l

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.