Answer:
1584 is your answer that you are looking for
I'll go slow:





Answer: B rational and equal to 0.
Maria do 1/2 work in 1 hour
Sasha do 1/3 work in 1 hour
Thus,
1/2+1/3=5/6 work in 1 hour
5/6 work in = 1 hour
1 work in =6/5=1.2 hours =72 minutes
D and E —> substitute the x or y of the point given into the functions to test if it is correct