6. \( 1389 k \star<3607 \) Yukarıdaki sıralamaya göre \( \star \) yerine yazı- labilecek rakamları farklı en küçük tek sayı ile rakamları farklı en büyük doğal sayının toplamı kaçtır? \( \begin{array}{ll}\text { A) } 4990 & \text { B) } 4997 \\ \text { C) } 4998 & \text { D) } 5000\end{array} \)

1. Află \( x \in \mathbb{N} \) dacă: (a) \( \frac{2 x+3}{x+1} \in \mathbb{N} \) (b) \( \frac{4 x+3}{3 x-1} \in \mathbb{N} \)

COLEGIO DE SAN SEBASTIAN, INC. Buenavista, Sablayan, Occidental Mindoro Junior High School Department Worskheet I Mathematics 9 Name: Grade and Section: \( \qquad \) Date: \( \qquad \) Score: \( \qquad \) /60 I. Direction: Solve each equation with the quadratic formula. (60pts) 1. \( 2 x^{2}-3 x-15=5 \) 4. \( 2 k^{2}+9 k=-7 \) 2. \( 2 x^{2}-36=x \) 5. \( 9 n^{2}=4+7 n \) 3. \( 5 x^{2}+9 x=-4 \) 6. \( 2 x^{2}-36=x \)

b) \( \frac{1}{6}-\frac{1}{4} x \geq 2+\frac{2}{3} x, x \in \mathrm{~W} \)

d) \( \frac{3}{4} y+\frac{1}{2}(y-3)<\frac{y+1}{4} \)

2. If \( \frac{\boldsymbol{x}}{\boldsymbol{y}}=\mathbf{3} \), and \( \boldsymbol{y}=\mathbf{6} \), what is the value of \( \boldsymbol{x}+\boldsymbol{y} ? \) \( 0_{12} \) 18 \( 0_{24} \) 30