Evaluate each expression when s = 9 and t = 12.
3(3t + s)
3(3t + s) = 3(3(12) + 9) = 3(36 + 9) = 3(45) = 135
To evaluate the expression 3(3t + s) when s = 9 and t = 12, follow these steps:
1. Substitute the values of s and t into the expression:
3(3(12) + 9)
2. Simplify the expression inside the parentheses:
3(36 + 9)
3. Perform the addition inside the parentheses:
3(45)
4. Multiply the coefficient, 3, by the simplified expression inside the parentheses:
3 * 45
5. Calculate the final product:
135
So, when s = 9 and t = 12, the expression 3(3t + s) evaluates to 135.