a) \( (11-7 \cdot 3)^{3}-(-19+25) \cdot(-2)^{2} \)

Let’s break it down step-by-step! First, we solve the expression inside the parentheses: \( 7 \cdot 3 = 21 \), so \( 11 - 21 = -10 \). Now cubing \(-10\) gives: \((-10)^3 = -1000\). Next, look at the second part: \(-19 + 25 = 6\), then calculating \((-2)^2 = 4\), we find: \(6 \cdot 4 = 24\). Now, combine these results: \(-1000 - 24 = -1024\). Therefore, the final result is \(-1024\).