Which of the following phrases translates to the expression y + 7?
o a number decreased by seven
the product of a number and seven
seven more than a number
a number divided by seven
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a
acv ran tirin

the correct answer is seven more than a number. the unknown number is y and you are adding 7 to it.

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."