A first number plus twice a second number is 9 . Twice the first number plus the second totals 33 . Find the numbers. The smaller of the two numbers is \( \square \).

8. A company has a fixed cost of \( \$ 2,000 \) and a variable cost of \( \$ 10 \) per unit for producing a product. Which of the following is the correct cost function \( C(x) \), where \( x \) represents the number of units produced? \( \begin{array}{ll}\text { a. } C(x)=2000 x+10 & \text { c. } C(x)=10 x-2000 \\ \text { b. } C(x)=2000+10 x & \text { d. } C(x)=2000-10 x\end{array} \)

9. A company sells its product at RM25 per unit. Which of the following represents the revenue function \( \mathrm{R}(\mathrm{x}) \), in terms of x , the number of units sold? \( \begin{array}{ll}\text { a. } R(x)=25 & \text { c. } R(x)=25+x \\ \text { b. } R(x)=25 x & \text { d. } R(x)=25-x\end{array} \)

2. \( y=k x+b \) funksiya grafigi \( A(0 ;-7), B(2 ; 3) \) nuqtalardan \( \sigma^{\prime} \) tadi. \( k \) va \( b \) ni toping. 3. To'g'ri chiziq \( A(0 ; 5), B(1 ; 2) \) nuqtalardan o'tadi. Shu to'g'ri

a. \( \frac{2 x-1}{x^{2}-3 x} \)

0. A small business has a revenue function \( R(x)=50 x \) and a cost function \( C(x)=20 x+ \) 500 , where \( x \) is the number of units produced and sold. What is the profit function \( P(x) \) ? \( \begin{array}{ll}\text { a. } P(x)=30 x & \text { c. } P(x)=30 x+500 \\ \text { b. } P(x)=70 x+500 & \text { d. } P(x)=30 x-500\end{array} \)