Write an inequality that represents "nine less than three times a number is greater than forty"? 9 - 3n > 40 9n < 3 + 40 3n < 9 + 40 3n - 9 > 40

Three times a number is 3n.  Nine less than that is 3n-9.  This is NOT the same thing: 9-3n.  Subtraction is not commutative.  If n was 1, for example, 3(1)-9=-6.  Looking at the other expression, 9-3(1)=6.  6 and -6 are definitely not the same number.  So be careful how you set up your expression.  Our inequality then would be

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