Answer:
20.5
Step-by-step explanation:
20 + 21 = 41. Divide 41 by 2 than you get 20.5.
The Answer is 36 miles in nine minutes
Answer:8
y=-5/2x+4
5x+2y=8
2y=8-5x
2y=-5x+8
y=-5/2x+8/2