Internal Energy Questions

The internal energy change in a system that has absorbed $2\text{Kcals}$ of heat and done $500\text{J}$ of work is:

An ideal gas goes from state $A$ to state $B$ via three different processes. If $Q_1,Q_2,Q_3$ indicate the heat absorbed and $\Delta U_1,\Delta U_2,\Delta U_3$ indicate the change in internal energy:

The amount of heat energy required to raise the temperature of $1\text{g}$ of Helium at NTP from $T_1\text{K}$ to $T_2\text{K}$ is: