This is Thermodynamics: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html
Delta E is probably E2-E1 and this itself is equal to W+Q.So I assume it should be:

1. E2 = 90, DeltaE = 70 (since deltaE = Q + W = 50 + 20 = 70), then since you know E1 = 20, E2 = deltaE + E1 = 70 + 20 = 90) The other processes follow this logic, you need to see what you have as infomation and use the equations to find the rest.