September 10th 2018 archive

Part 1:

2, 10, 18, 26, 34.. $t_50$

$t_n$ = $t_1$  (n – 1)d

$t_n$ = 2 + (50 – 1)d

$t_50$ = 2 + (49)8

$t_50$ = 2 + 392

$t_50$ = 394

Part 2:

$s_n$ = $\frac{n}{2}$ ($t_1$ + $t_n$)

$s_n$ = $\frac{50}{2}$ (2 + 394)

$s_n$ = 25(396)

$s_n$ = 9900