USING EQUATIONS to solve WORD PROBLEMS Directions: Set up and solve an equation for each problem below. 8. Kelly, Laura, and Tia sold boxes of cookies fol fundraiser. Kelly sold 15 boxes less than Laura Tia sold twice as many boxes as Kelly. If they sold 83 boxes of cookies in total, how many boxes did each girl sell?

\( \begin{array}{ll}\text { Solve for } x: \\ 1.1 .1 & x(x-10)=0 \\ 1.1 .2 & 7 x^{2}-5 x-6=0 \text { (correct to TWO decimal places) } \\ 1.1 .3 & (x+2)(2 x-4) \geq 0\end{array} \)

Q1) The last term in the expansion of \( (3-x)^{5}(3+x)^{5} \) according to the ascending powers of \( x \) is ....... \begin{tabular}{|l|l|l|l|l|l|l|}\hline (A) \( x^{5} \) & (B) \( -x^{5} \) & ( \( ) ~ \) & \( x^{10} \) & (D) \( -x^{10} \) \\ \hline\end{tabular}

Senior 1 Algebra \( \begin{array}{lll}\text { If } f(x)=3 x, \text { then the sign of the function is negative in the interval }] \\ \text { (a) }]-\infty[ & \text { (b) }] 3, \infty[ & \text { (c) }]-\infty, 0[ \\ \text { Sol }]-3, \infty[ \end{array} \) Solution

\[ f(x)=x^{2}-42 x+80 \] The function \( f \) is defined by the given equation. Which of the following equivalent forms of the equation displays the zeros of the function as constants or coefficients? (A) \( f(x)=x^{2}-5 x-37 x+80 \) (B) \( f(x)=(x-2)(x-40) \) (C) \( f(x)=x(x-42)+80 \) (D) \( f(x)=(x-21)^{2}-361 \)

solve the Pollowing systew using. \( A^{-1} \) \( \begin{array}{l}4 x+2 y-z=5 \\ 3 x-y-z=-2 \\ x+y-z=0\end{array} \)