Simplify the expression:

To simplify the expression \( 2c^2 + 9c^2 + 5c^2 \), you can combine the like terms (which are all \( c^2 \) terms):

\[ 2c^2 + 9c^2 + 5c^2 = (2 + 9 + 5)c^2 \]

Now, add the coefficients together:

\[ 2 + 9 + 5 = 16 \]

So, the expression simplifies to:

\[ 16c^2 \]

Therefore, the simplified expression is \( \boxed{16c^2} \).