Answer:
The third time = 11.64 seconds
Step-by-step explanation:
Let the average time be x
The average of a set of numbers is the sum of the numbers divided by the number of terms. In this case:
Average = (10.84 + 13.52 + x) ÷ 3 = 12.0
18 is the correct answer to this
18/9=2
Explain it better
Take a picture of it
2/3 more then
D. 18
change 20% to decimal by dividing by 100.
20/100 = 0.20
Now multiply by 90.
90 x 0.20 = 18
5c+4d=10
3c+2d=16
8c+6c=26