Final answer:
The expression that is not equal to 18 is D) 9t ÷ 3, t = 5.
Step-by-step explanation:
To determine which expression is not equal to 18, we can substitute the value of t in each expression and see if it equals 18 or not.
- A) 2t, t = 9: 2(9) = 18, so this expression is equal to 18.
- B) t - 5, t = 23: 23 - 5 = 18, so this expression is equal to 18.
- C) 3t + 3, t = 5: 3(5) + 3 = 18, so this expression is equal to 18.
- D) 9t ÷ 3, t = 5: 9(5) ÷ 3 = 15, so this expression is not equal to 18.
Therefore, the expression that is not equal to 18 is D) 9t ÷ 3, t = 5.
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