Answer: hi
Step-by-step explanation:
20.
Answer:
Step-by-step explanation:
x + z + y = 60
- x + z + y = -6 <-- (x - z = y + 6)
x + 3z + y = 40
<em>cancel out the two equations (z minus each other and y minus each other)</em>
x + z + y = 60
- -x + z + y = -6
________________
2x + 0 + 0 = 66
x = 33
3 ft because that is the average size of a door frame
1/3 of an hour = 20 mins
1/6 * 3/1 = 3/6 = 1/2
Unit rate = 1/2 mile per hour
