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

Alg2 
Rock,
240

Alg2 
MathMate,
Perfect!

Alg2 
Rock,
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,
Sorry Rock.
Please make a new post. Tagging on an existing post will only slow down your response.
Thanks. 
Alg2 
Rock,
Thanks, I did!

Alg2 
YourWay2a100,
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Connexus students for quick check 4 Lesson 6 permutation I got 100%