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
Are a and b two points on a line
If they are you can use the distance formula
Answer:
Notice that 2 sheets of stamps will NOT be enough because 2 sheets have a total of 40 stamps and NOT 47
Step-by-step explanation: