It says "for 1983 through 89, the per capital consumption of chicken in the us increased at a rate that was approximately linear. in 1983, the per capita consumption was 30.9 pounds , and in 1989 it was 47 pounds. write linear model for per capital consumption of chicken in the us. let t represent time in years, where t=3 represents 1983. let y represent chicken consumption in pounds"
this is the question its asking using this information (in the picture)

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?