Question

Question 1 (i)
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 A.P.
$\begin{array}{cccc}a& d& n& a_n\\ 7& 3& 8& \dots \dots \end{array}$

Answer 1

Given, a = 7, d = 3 and n = 8
We know that,
$a_n=a+(n-1)d$
$a_8=7+(8-1)\times 3$
$=7+\left(7\right)\times 3$
$=7+21=28$
$So,a_8=28$