Creati took most my pints from 1,500 all the way to 600 and my brainlest he/she took all my answers it said i had 78 notifications and i had answered 77 so i will give all my points so watch out for my next give away

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Step-by-step explanation:

okay! thanks! :

551

Step-by-step explanation:

The sum to n terms of an arithmetic sequence is

= ( first + last)

The number of terms is

= a + (n - 1)d ← d is the common difference, a is the first term

d = 5 - 2 = 8 - 5 = 3, hence

2 + 3(n - 1) = 56

2 + 3n - 3 = 56

3n - 1 = 56 ⇒ 3n = 57 ⇒ n = 19

= ( 2 + 56 ) = 19 × 29 = 551