Final answer:
To find the rate as a unit rate, divide the total number of registered voters by the number of senators. In this case, the unit rate is 328,686 voters per senator.
Step-by-step explanation:
To find the rate as a unit rate, divide the total number of registered voters by the number of senators. In this case, the total number of registered voters is 986,058 and there are three senators. So, the unit rate can be calculated as:
986,058 registered voters / 3 senators = 328,686 voters per senator
Therefore, the rate as a unit rate is 328,686 voters per senator.