Posted by **Rock** on Sunday, December 4, 2011 at 2:24pm.

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?

- Alg2 -
**MathMate**, Sunday, December 4, 2011 at 2:35pm
Find all the arrangements for 5 books, and multiply by two, i.e. putting the dictionary at either end.

- Alg2 -
**Rock**, Sunday, December 4, 2011 at 2:46pm
240

- Alg2 -
**MathMate**, Sunday, December 4, 2011 at 2:50pm
Perfect!

- Alg2 -
**Rock**, Sunday, December 4, 2011 at 8:11pm
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?

- Alg2 -
**MathMate**, Sunday, December 4, 2011 at 8:44pm
Sorry Rock.

Please make a new post. Tagging on an existing post will only slow down your response.

Thanks.

- Alg2 -
**Rock**, Sunday, December 4, 2011 at 8:45pm
Thanks, I did!

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