4,083,817 what 3 digits are in the units period?

817.

Explanation:
The units period is the right most three numbers before the decimal or 8 is in the hundreds place, 1 is in the tens place, and 7 is in the ones or units place this give us the answer 817.

With out knowing the functions you have to chose form, this could be one.y = 5.00xx = hours worked and y = the money he will earn.