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To add the polynomial expressions \( 2r^2 - 3r + 4 \) and \( -2r^2 + 3r + 6 \), combine like terms:
1. **Add the \( r^2 \) terms:**
\[
2r^2 + (-2r^2) = 0r^2
\]
2. **Add the \( r \) terms:**
\[
-3r + 3r = 0r
\]
3. **Add the constant terms:**
\[
4 + 6 = 10
\]
Putting it all together, we get:
\[
0r^2 + 0r + 10 = 10
\]
Thus, the sum of the polynomial expressions \( 2r^2 - 3r + 4 \) and \( -2r^2 + 3r + 6 \) is:
\[
\boxed{10}
\]