Yolanda purchased a prepaid phone card for \( \$ 45.50 \). Calls cost 7 cents a minute using this card. The credit, \( C \) (in dollars), left on the card after it is used for \( x \) minutes of calls is given by the following function. \[ C(x)=45.50-0.07 x \] How much credit is left on the card after Yolanda uses it for 40 minutes of calls?

4. Jug A contains 5 times as much water as Jug B. After some water is poured from Jug A to Jug B, there are 1860 ml of water in each jug. How much water is poured from Jug A to Jug B?

\( 19 j-86 \geq 5 \) or \( 27 j-82 \leq 18 \)

-11) \( \frac{22^{4} \cdot 8^{4}}{121^{4} \cdot 4^{6}}= \)

QUESTION 3 3.1 Given the number pattern \( 2 ; y ; 8 ; \ldots \) Determine the value of \( y \) if: 3.1.1 The number pattern is linear. 3.1.2 The number pattern is quadratic and \( T_{4}=2+5 y \). 3.2 In a linear number pattern, the \( 19^{\text {th }} \) term is 40 and the \( 7^{\text {th }} \) term is 16 . Thus, determine the first two terms. 3.3 The general term of a quadratic number pattern is \( T_{n}=n^{2}+2 n-15 \). Determine which term has a value of 20 .

9. Use any method to solve the system: \( \left\{\begin{array}{c}x^{2}+y^{2}=9 \\ 9 x^{2}+4 y^{2}=36\end{array}\right. \)