Math, asked by aquagirl728, 7 months ago

Find the sum of first 14 terms of the sequence -3, 3, 9, 15.

Answers

Answered by Anonymous

1

Answer:

Step-by-step explanation:

This is an AP

with a=-3

d=6

Sn = n/2(2a+(n-1)d)

= 14/2(2(-3)+(14-1)6)

7(-6+13*6)

504 ans...

Answered by Snapskg730

4

Answer:

a = -3

d = 3-(-3) = 6

a14 = a + 13d

= -3 + 13(6)

= -3 + 78

= 75

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