To evaluate the expression \((t + 8) \div u\) with the given values \(t = 4\) and \(u = 3\), follow these steps:
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Substitute the values of \(t\) and \(u\) into the expression: \[ (4 + 8) \div 3 \]
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Calculate \(4 + 8\): \[ 12 \]
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Now, divide by \(u\) (which is 3): \[ 12 \div 3 = 4 \]
Thus, the value of the expression is \(4\).