How many ectonda are in: siminutes \( =30 \) seonds 50 minues \( =60 \) seconds. a haurs \( =365 \) seconds.

13 Factoriser chacune des expressions suivantes a ) \( F=x^{2}+x \) b ) \( G=2 a+3+2\left(\frac{3}{2}-a\right)(2 a+3) \) c) \( H=2 y(1-y)-(1-y) \) d) \( F^{\prime}=5 x^{3}-8 x^{2}-x \) e) \( G^{\prime}=(4 t-1)(2-t)+2-t-3(2-t) \)

10 Solve. Clear fractions or decimals first. \( \frac{7}{3} x+\frac{1}{3} x=3 x+\frac{45}{3}+\frac{8}{3} x \)

A rectangular plot of farmland will be bounded on one side by a river and on the other three sides by a single-strand electric fence. With 1900 m of wire at your disposal, what is the largest area you can enclose, and what are its dimensions? The maximum area of the rectangular plot is

4) Uma escada encostada em um ediflcio tem seus pés afastados a 50 m do edificio, formando assim, com o plano horizontal, um Ângulo de \( 32^{\circ} \) A altura do ediffcio é aproximadamente \( \begin{array}{llll}\text { A) } 2841 \mathrm{~m} & \text { B) } 29,87 \mathrm{~m} & \text { C) } 31,24 \mathrm{~m} & \text { D) } 34,65 \mathrm{~m}\end{array} \)

7. Aşağıdakilerden hangisi 16 sayısının 100'den küçük doğal sayı katlarının topla- mıdır? \( \begin{array}{llll}\text { A) } 300 & \text { B) } 318 & \text { C) } 324 & \text { D) } 336\end{array} \)