Answer:
1 1/15
Step-by-step explanation:
(I think)
And I am not a very good explainer
(sorry)
Answer: OPTION A
Step-by-step explanation:
We need to remember that Product of powers property, which states that:
Let's check the options:
A. For 
you can apply the property mentioned before. Then:
(It is the equivalent expression)
B. Add the exponents:
(It is not the equivalent expression)
C. For 
you can apply the property mentioned before. Then:
(It is not the equivalent expression)
D. We know that 
and we maje the addition indicated in this option, we get:
(It is not the equivalent expression)
First, we convert it into a unit like this
20 workers × 30 days = 600 units work
After leaving the 5 workers, we have 35 days to complete the work.
In 35 days only 15 workers will do the work.
So the work completed in 35 days by 15 workers = 35 ×15 =525 units
Remaining unit = 600 -525 =75 units
This unit would do by 5 workers in (75/5) = 15 days.
So after 15 days, 5 workers should leave the job.
There are 66.666666 etc..... so if you round you get
67%
Since F(X) = 3^X,
F(4) = 3^4 = 81
