A number plus 5 is less than nine.

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Answer: x + 5 < 9

Step-by-step explanation:

A number: you can use any variable, such as an x.

Plus 5: plus means "+" and 5 is obviously 5.

Less than nine: less than means the number you wrote before has to be less than 9. You can use the "<" symbol for any equations that say "less than."