Question 1

Fill in the blanks in the following table, given that $a$ is the first term, $d$ the common difference and $a_n$ the $n$th term of the AP:

$$\begin{array}{|c|c|c|c|}

\hline
a & d & n & a_n \\
\hline
7 & 3 & 8 & \text{.} \\
\hline
-18 & \text{.} & \text{.} & 100 \\
\hline
\text{.} & \text{.} & -3 & 18 \\
\hline
-18.9 & 2.5 & \text{.} & 3.6 \\
\hline
3.5 & 0 & 105 & \text{.} \\
\hline
\end{array}$$