basic math
posted by tea .
Determine if the given rates are equivalent.
9in/57 miles = 6 in/38 miles

If 9 inches = 57 miles, then 1 inch equals 6 1/3 miles.
If 6 inches = 38 miles, then 1 inch equals 6 1/3 miles. 
Find the best buy on Shampoo:
4oz for 1.16
7 oz for 1.52
15 oz for 3.39 
First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.
See your later post.