What is the sum of the first 11 terms in the arithmetic sequence if the first term is -3 and the common difference d is 5.   a.
152

b.
352

c.
402

d.
242

d

Step-by-step explanation:

The sum to n terms of an arithmetic sequence is

= [ 2a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Here a₁ = - 3 and d = 5, thus

= [ (2 × - 3) + (10 × 5) ]

      = 5.5(- 6 + 50)

       = 5.5 × 44

       = 242 → d

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