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Answered

1. Using the formula find the sum of the arithmetic sequence 3, 7, 11.15, 19, 23, 27, 31.
Given:
Solution: Sr= (a1 + an)
al =
an =
11
n =
d =
Asked:
Sn​

Sagot :

NINALACERNAIN

Answer:

I don't know

Step-by-step explanation:

CLUSTODI30IN

the arithmetic sum is 105

Step-by-step explanation:

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

S7=7/2 [2(3) + (7-1) 4.0]

=3.5 [6 + (6)(4.0)]

=3.5 (30)

=105

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