6x^2 should be one of them if i am not mistaken!
21 divide by 4 is 5.25. She travels 5.25 miles per hour. 42 divide by 5.25 is 8. It would take 8 hours for Shelly to bike 42 miles.
Answer: I believe it should be -5,-3
Divide 2520 by 18 to get unit rate. It calculates to 140 meters to every 1 unit.
