Answer:
10 years
Step-by-step explanation:
the average or mean value is the sum of all data points divided by the number of data points.
x = the unknown age of the 5th student.
average = 9 = (5 + 7 + 8 + 15 + x)/5
45 = 5 + 7 + 8 + 15 + x = 35 + x
x = 45 - 35 = 10
the 5th student is 10 years old.
2 times (9+7)
500 and 5,000
The value of the first 5 is five hundred (500)
The value of the second is five thousand (5,000)
hopefully this will help ( ;
