1. The problem is to express the number 2.74 x 10^{-5} in decimal form. 2. The number is given in scientific notation, which is a way to express very large or very small numbers. 3. The general form of scientific notation is $a \times 10^n$, where $a$ is a number between 1 and 10, and $n$ is an integer. 4. Here, $a = 2.74$ and $n = -5$. 5. A negative exponent means we move the decimal point to the left by $|n|$ places. 6. Moving the decimal point 5 places to the left in 2.74 gives 0.0000274. 7. Therefore, $2.74 \times 10^{-5} = 0.0000274$. 8. This is the decimal equivalent of the given scientific notation.