QUESTION 3 3.1 The fourth, fifth and sixth terms of a geometric sequence are respectively. Determine (a) the possible values for \( x \). (b) the value for the first term in the sequence if \( x>0 \) (1 \( \mathrm{e} x \) is positive). 3.2 The first term of an arthmetic sequence is 10 and the sıxth term is 85 . Find the first three terms of the sequence.

Find the magnitude and direction of the vector \( v=\left(\frac{4}{3}\right) \)

6. a) Tekna i rettari stadd ein trihyming, sum hevur hesar siöumar AC \( =6 \mathrm{~cm} \quad \mathrm{BC}=8 \mathrm{~cm} \quad \mathrm{AB}=10 \mathrm{~cm} \) b) Hvussu stórur er vinkul C ? 7 a) Tekna i somulkrosskinan eina liniu, iô qongur igiegnum punkinini \( (2,5) \mathrm{og} \)

Прямая \( A B \) касается окружности с центром в точке \( O \) радиуса \( r \) в точке \( B \). Найдите \( O A \) если известно, что \( A B=8 \cdot \sqrt{3}, r=2 \).

(a) This line passes through \( (-1,2.5) \). Find the value of (b) On a piece of graph paper, draw the graph \( a x+2 y=3 \) for \( -3 \leq x \leq 3 \). (c) Find the value of \( y \) when \( x=2.5 \)

\( \left. \begin{array} { l } { \frac { 4 } { \sqrt { 2 } } } \\ { x - 3 } \end{array} \right. \)