Question

Sigma1^30 (3n + 7) = [? ]

Answer 1

1425

Explanation:

∑ 1 ^30 (3n+1)=4+7+10+... 30 terms

a=4

n=30

d=7-4=3

`S_(30)=(30)/(2)[2 * 4+(30-1) * 3]\\=15[8+87]\\=15 * 95\\=1425`

Answer 2

1605

Explanation:

hope this helps you guys on acellus