The answer is -21. Rule is that you follow the sign of the larger and add the opposite
Answer:
Hurry and do it before the marking period ends. You could really use good grades to get in a good college so you should get some sleep then drink some water and try and do your work.
Step-by-step explanation:
Answer: 200 miles per hour
Step-by-step explanation:
200miles per 60 minuets
1/2 hour = 30 minuets
200/0.5 = 100
Therefore, to travel 100 miles in 1/2 an hour you would have to be going 200 miles per hour.