4.2 In 2002 a school population was 1250 By \( 200^{\prime} \) the population had dropped to 900 Assume the population is Charging linealy. 4.21 Find an equation for the population, of the school \( t \) years after 2002 4.2 .2 In which year will the school dose?

12. Marcela vende 2 tipos de adornos: esferas grandes \( (x) \) a \( \$ 300 \) y esferas chicas \( (y) \) a \( \$ 200 \). Si vendió 100 esferas en total y recaudo \( \$ 27.000 \), ¿Cuál de los siguientes sistemas permite calcular correctamente el número de esferas de cada tipo que vendió? \( \begin{array}{ll}\text { A. } x+y=100 & \text { C. } x+y=27.000 \\ x+y=27.000 & 300 x+200 y=100\end{array} \) \( \begin{array}{ll}\text { B. } x+y=100 & \text { D. } 300 x+200 y=100 \\ 300 x+200 y=27.000 & 300 x+200 y=27.000\end{array} \)

It is with the peoples of Africa, then, that our inquiry is concerned. It is they who carry the "Black man's" burden. They have not withered away before the white man's occupation. . . In hewing out for himself a fixed abode in Africa, the white man has massacred the African in heaps. The African has survived, and it is well for the white settlers that he has. - "The Black Man's Burden" by E. D. Morel A. To undermine claims that imperialism was harmful to colonized societies in Africa expressed in this passage? B. To encourage more African Americans to participate in imperialist missions in Africa C. To demonstrate that colonized peoples do not require help from

Given the matrix in row echelon form below, list the three simultaneous equations represented in it. \( \left(\begin{array}{lll}7 & 1 & 2 \\ 0 & 2 & 3 \\ 0 & 0 & 3\end{array}\right)\left(\begin{array}{l}x \\ y \\ z\end{array}\right)=\left(\begin{array}{l}1 \\ 6 \\ 7\end{array}\right) \)

4) Solve: \( |2 x-1| \geq 5 \)

Factorise \( 3 x^{2}+11 x-4 \)