A national park covers an area of 1.42×106

To find the total area of the national park and the national forest combined, we need to add their areas together.

The area of the national park is \(1.42 \times 10^6\) acres, and the area of the national forest is \(1.2 \times 10^6\) acres.

Now, let's add these two values:

\[
1.42 \times 10^6 + 1.2 \times 10^6 = (1.42 + 1.2) \times 10^6 = 2.62 \times 10^6
\]

So, the total area in acres of the park and the forest combined is:

\[
\mathbf{2.62 \times 10^6} \text{ acres}
\]

Therefore, the correct response is:

**2.62×106** (2.62 times 10 superscript 6 baseline)