Answer:
area of a rectangle = 4(length × width)
0.85 is between 0.8 and 0.9
As in each table can seat 8 people and the probability you need to find is about the first person you can ignore this data.
Probability that the first person to enter the room will be randomly seated at a maple table:

#maple tables: 9
# total tables: 9 +10 +5 +7=31

Then, the probability that the first person to enter the room will be randomly seated at a maple table is 9/31
6x^3 + 5y^3 + 7y
So the third option.
The function is discrete, as the fee is charged based on the hours