Question 666414
Let us assign the random variable "n" to the "number" (you can choose whatever you want, such as "x" or "a" if you prefer).
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n = number
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"5 times a number" is like saying 5 * number. Since we said that n = number, we can change "number" to "n": 5 * n, or 5n.
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5n = 5 times a number
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"10 less than 5 times a number" is the same as saying "5 times a number minus 10." As a result, we get the expression 5n - 10.
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5n - 10 = 10 less than 5 times a number
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Therefore, an expression to represent "10 less than 5 times a number" is 5n - 10.