A new television depreciates \( \$ 140 \) per year, and it is worth \( \$ 400 \) after three years. Find a function that describes the value of this television, if \( x \) is the age of the television in years. \( f ( x ) = \square \) (Simplify your answer. Do not include the \( \$ \) symbol in your answer.) 

Simplify. \( 6 v+3 v \)

\( x + 5 y \)

Evaluate the expression when \( a=6 \) and \( b=27 \). \[ b-4 a \] \( \square \) \begin{tabular}{ccc}\hline\( \square \) & 5 \\ \hline\end{tabular}

\begin{tabular}{l} Evaluate the expression when \( c=8 \) and \( d=4 \). \\ \( \qquad \frac{48}{c}+d \) \\ \( \square \square \) \\ \hline\( \square \) \\ \hline\end{tabular}

(8) If \( L^{2} \) and \( L \) are the two roots of the equation : \( x^{2}+a x+8=0 \), then \( a=\ldots \ldots \ldots \) \( \begin{array}{llll}\text { (a) }-6 & \text { (b) } 6 & \text { (c) } 4 & \text { (d) } 8\end{array} \)