Mathematical Help needed with rational exponents and complex numbers

*Answers and explanations

1.  Write 

b.  Find the distance the car will skid if the speed of the car is 60 miles per hour.
Round to two decimal places.

3. Complex numbers are used by engineers and physicists to measure electrical circuits. To measure voltage, they use the formula E = I • Z, where E  is voltage in volts, I  is the current in amps, and Z is impedance, or resistance, in ohms.

a. Find the voltage for an electrical circuit if the current is 3 – 4i  amps and the impedance is 2 + iohms. Simplify your answer completely.    

b. Find the Impedance for an electrical circuit if the voltage is 18 – 24i  and the current is 6 – 3iamps. Simplify your answer completely.