Question

consider the arithmetic sequence 5 9 13 what is its sum of of its first 30 terms​

Answer 1

Answer:

1890

Step-by-step explanation:

here, a= 5

d= 9-5=4

n = 30

then by formula,

Sn = n÷ 2 [2a + ( n-1 ) d]

= 30 ÷ 2 [2 × 5 + ( 30-1 ) × 4 ]

= 15 ( 10 + 29 × 4 )

= 15 × 126

= 1890

Answer 2

Answer:

Step-by-step explanation:

n is the 30 th term

hope this will help you