To find the total number of pizza slices, you can simply multiply the number of students by the number of slices each student has.
So, if there are 9 students and each has 4 slices:
\[ \text{Total slices} = 9 \times 4 = 36 \]
Now, let's examine the expression you provided:
\[ 9 + 49 - 49 \times 49 \div 4 \]
We'll evaluate this step by step:
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Calculate \(49 \times 49\): \[ 49 \times 49 = 2401 \]
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Now divide \(2401\) by \(4\): \[ 2401 \div 4 = 600.25 \]
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Next, substitute this back into the equation: \[ 9 + 49 - 600.25 \]
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Add \(9\) and \(49\): \[ 9 + 49 = 58 \]
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Now, subtract \(600.25\) from \(58\): \[ 58 - 600.25 = -542.25 \]
Hence, the result of the expression \(9 + 49 - 49 \times 49 \div 4\) is \(-542.25\), but this does not contribute to finding the total number of pizza slices.
The correct calculation for the total number of pizza slices is simply \(36\).