M = - 10 + 9 / 2 + 5
m = - 1 / 3
The round trip was 8 miles ( 4 + 4 = 8)
The total time for the trip is 3/10 + 1/2
Rewrite 1/2 as 5/10
Now add 3/10 + 5/10 = 8/10 = 4/5 hour for the 8 mile trip.
Now to find miles per hour, divide total miles by total time:
8 miles / 4/5 hour
When you divide by a fraction flip the fraction over and multiply:
8 x 5/4 = 40/4 = 10
The average rate was 10 miles per hour.
Addition is the inverse of subtraction and multiplication is the inverse of division.
Ex: 1+1 = 2, 2-2 = 0
4 x 225 = 900
17500 / 900 = 19.44
Therefore he will need 20 volunteers
There are 14 times in the table. Add up all 14 times, and divide the sum by 14. The result is the "mean 100-meter sprint time," assuming that you've rounded this off to the nearest tenth of a second.
