What to do when you can't remember a formula for a word problem?

Tyrion101
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How do you reason it out? I get confused on problems that involve distance rate and time. What wording should I look for to tell me if s should be positive and the number should be negative or any variation in between? Should there never be a negative involving a DRT formula?
 
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what often works is just do math that makes the units work out right.
 

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