25.9. Найдите наибольшее целое значение \( x \), удовлетворяющее нера- венству: \( \begin{array}{ll}\text { 1) } 9^{x+1}-3^{x+3}<3^{x}-3 ; & \text { 2) } 13 \cdot 2^{x+4}-208 \cdot 2^{-2 x-3}<0 \\ \text { 3) } 7 \cdot 3^{x-2}+20 \cdot 3^{2-x}<\frac{41}{3^{x-2}} ; & \text { 4) } \frac{440}{c^{x}}-2 \cdot 6^{x}>8 \cdot 6^{-x}\end{array} \)

Solve the equation by factoring. \[ x^{2}=7 x-12 \]

b. Two consecufive number are sucl that the sum of thrice the smaller and twice the larger is 17. Find, correct to three significant figures the smaller number as a percen - tage of the sum of the. two numbers.

A. \( 4 x^{2} y\left(x z^{2}+5 w x y+3\right) \).

Solve the following system of equations by the addition method. If the system does not have a single ordered pair as a solution, state whether the system is inconsistent or dependent. \[ \begin{aligned} 4 x+3 y & =-14 \\ 2 x-y & =-12\end{aligned} \]

23. Reasoning Twenty of the students in Hannah's class, or \( 80 \% \) of the class, voted to have pizza fol lunch every Wednesday. How many students are in Hannah's class?