Which term of the sequence `20 ,\ \ 19 1/4,\ \ 18 1/2,\ \ 17 3/4,\ dot` is the first negative term?

Explanation

To find the first negative term of the sequence \(20, 19 \frac{1}{4}, 18 \frac{1}{2}, 17 \frac{3}{4}, \ldots\), we can follow these steps:

### Step 1: Identify the first term and the common difference
The first term \(a\) of the sequence is \(20\). The sequence decreases, so we need to find the common difference \(d\).

The second term is \(19 \frac{1}{4} = 19.25\).

To find the common difference:
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