Q6. It gets extremely cold in the north of Alaska. On one particular day it was \( 5^{\circ} \mathrm{C} \) at midday. It then dropped \( 3^{\circ} \mathrm{C} \) every hour for the next 7 hours. It remained at that temperature until 3 a.m. and then it dropped a further \( 7^{\circ} \mathrm{C} \). What was the final temperature at 3 a.m.?

R W SOLVER EL SIGUIENTE EIERCICIO COMBINADO DE NUMEROS ENTEROS APLICT REGLA DE LOS SIGNOS \[ (5-8)^{2}+\sqrt{3.5+10}-(14: 2-9)^{3}= \]

Calculer: \( (-3) \div(-2) ; 8 \div(-4) \quad ; \quad \frac{(-72}{9} \)

4) Schrijf de getallen als machten van 10 en bereken \( \frac{0,0017 \times 85000000}{0,00068: 0,0000004}= \)

(b) \( (-8) \times(+7) \)

12. Бастапқыда құны А теңге болатын кітап 30\%-ға қымбаттады. Одан кейін тағы 10\%-ға қымбаттап, ең соңында 50\%-ға арзандады. Кітаптың бағасы қанша теңге болды? (A) \( 0,9 A \) (B) \( 0,885 A \) (C) \( 0,785 A \) (D) \( 0,715 A \)