We have that 18,000 volts, and 1000 volts is a kilovolt. Then, we have:
[tex]18000\text{volt}\cdot\frac{1kV}{1000\text{volt}}=18kV[/tex]Therefore, 18,000volts are 18 kilovolts (18 kV).
Part B
We have that 1000 millivolts are equivalent to 1 volt, then, we have:
[tex]435\text{milivolts}\cdot\frac{1\text{volt}}{\text{1}000\text{milivolts}}=0.435\text{volt}[/tex]Therefore, 435 mV is 0.435 V.
In summary, we have:
18,000 volts are 18 kilovolts (18 kV)
435 millivolts are equivalent to 0.435 volts (0.435