12. \( \left(a_{n}\right) \) aritmetik dizisinde \( a_{1}=1 \) ve ortak fark 4 ise bu dizinin ilk 20 terim toplamı kaçtır? \( \begin{array}{llll}\text { A) } 600 & \text { B) } 640 & \text { C) } 720 & \text { D) } 780\end{array} \)

1. \( 3-8 \)

To be adopted, a resolution must be approved by at least \( 2 / 3 \) of the members of the assembly. There are 435 members in the assembly. Find the number of members who must approve the resolution for it to be adopted.

7. \( 6-17-4 \)

11. You begin a hike in Death Valley, California, at an elevation of -86 meter You hike to a point of elevation at 45 meters. What is your change in elevation?

The fuel consumption of a cor is 94.8 miles per gallon conversion factors \( 1 \mathrm{mi}=1.609244 \mathrm{Km}, 1 \) gallon \( =4.546 \) Litres a) Find the fuel consumption in \( \mathrm{Km} / \mathrm{L} \) b) Find the number of litres of fuel required to drive 100 km