Question

If d=3 n=18 and an=-5 then find first term

Answer 1

Answer:

$a = ?$

$a_n= -5$

$d=3$

$a_n = a + (n-1) d$

$-5 = a + 17 × 3$

$-5 = a + 51$

$-5-51 = a$

$a=-56$