Alg2
posted by Rock .
How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be on an end?

Find all the arrangements for 5 books, and multiply by two, i.e. putting the dictionary at either end.

240

Perfect!

Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?

Sorry Rock.
Please make a new post. Tagging on an existing post will only slow down your response.
Thanks. 
Thanks, I did!

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Connexus students for quick check 4 Lesson 6 permutation I got 100%