In a bookcase, there are 7 fiction books for every 8 nonfiction books. there are 75 books in the bookcase. how many nonfiction books are in the bookcase?

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The triangles are similar. what is the value of x? show your work.

If myesha works overtime, she gets paid "time and a half" for every hour she works. in other words, for every hour over 40 hours myesha works each week, she gets her hourly pay plus half her hourly pay. what is myesha's pay per hour when she works overtime?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?