Answer:
AD=2
Step-by-step explanation:

Hey there, all you do is multiply 20 by 20, 20×20=400. Therefore, the answer is 400 square feet.
A. 100/20
The distance in meters should be divided by the time in seconds to get the value of the distance in meters travelled in one second.
In order for a triangle to exist, the two smaller sides must add to a number greater than the largest side.
So, 13+10 = 23
So, the number has to be smaller than 23, and the largest whole number less than 23 is 22.
22 Is the largest possible whole number.