It took Daniela 3/4 of an hour to do her mouth and work it took her 4/5 of an hour to do the English homework how much more time do Daniela spend on her English homework then on her math homework

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there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

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