-18,1+43 1/4

To calculate \(-18.1 + 43 \frac{1}{4}\), first, convert \(43 \frac{1}{4}\) to an improper fraction or a decimal.

\(43 \frac{1}{4} = 43 + \frac{1}{4} = 43 + 0.25 = 43.25\).

Now, perform the addition:

\(-18.1 + 43.25\).

Aligning the numbers for better clarity:

\[ \begin{array}{r} -18.1 \\ + 43.25 \\ \hline \end{array} \]

Now, convert \(-18.1\) to have two decimal places: \(-18.10\).

So now the addition looks like:

\[ \begin{array}{r} -18.10 \\ + 43.25 \\ \hline \end{array} \]

Now, performing the addition:

\(-18.10 + 43.25 = 25.15\).

Thus, the result of \(-18.1 + 43 \frac{1}{4}\) is \(25.15\).