\[
\begin{array}{l}
s(x)=2 x+1 \\
t(x)=-2 x^{2}+1
\end{array}
\]
Find the value of $t(s(4))$

Answer

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Answer

So, the final answer is $\boxed{-161}$.

Steps

Step 1 ：First, we need to find the value of $s(4)$ by substituting $x = 4$ into the function $s(x) = 2x + 1$.

Step 2 ：So, $s(4) = 2*4 + 1 = 9$.

Step 3 ：Then, we substitute the result into the function $t(x) = -2x^2 + 1$ to find the value of $t(s(4))$.

Step 4 ：Substituting $s(4) = 9$ into $t(x)$, we get $t(9) = -2*9^2 + 1 = -161$.

Step 5 ：So, the final answer is $\boxed{-161}$.