Answered

find the sum of the first 12 terms of the arithemetic sequence 4,11,18,...​

Sagot :

FOOTLONG1275GO

Answer:

510

Step-by-step explanation:

Formula:

Sn = n/2 [ 2a1 + (n - 1) d ]

S12 = 12/2 [ 2(4) + (12 - 1) 7 ]

S12 = 12/2 [ 8 + (11) 7]

S12 = 12/2 (8 + 77)

S12 = 12/2 (85)

S12 = 6 (85)

S12 = 510

Answer:

Find the sum/Plus of the first 12 terms of the arithemetic sequence 4,11,18,...​

Step-by-step explanation:

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