The calculations for the combined circuit homework appear to be mostly correct, with the total voltage (Vt=30V), total current (It=4.3A), and total resistance (Rt=7Ω) accurately stated. The voltage drops across the resistors and the currents through each branch are also correctly identified. However, it's important to note that electrical currents have a direction, which should be marked with arrows, and any current flowing opposite to this direction should be considered negative. Additionally, when determining voltages at specific points in the circuit, a reference point, often designated as ground (V=0), should be established to calculate other voltages accurately. Overall, the breakdown of the problem is sound, with minor adjustments needed for clarity on current direction and voltage reference points.
